Yellowstone with kids.

Old Faithful itself is the headliner, but the area is a half-day to a full day if you do it right. Eruptions run on a roughly 90-minute cycle. Predictions are posted inside the Old Faithful Visitor Education Center and on the NPS app. Get there twenty minutes early for a bench seat with a clear view; the back of the crowd misses the start.

The under-discussed move: walk past Old Faithful itself to the boardwalk loop. Castle, Grand, Daisy, Riverside, and Morning Glory Pool are all within a 2-mile flat boardwalk loop. The kids who get bored with Old Faithful re-engage at Castle Geyser. Bring water; the basin is exposed and treeless.

Old Faithful Inn breakfast on the deck is the operational hack nobody else publishes. Order to go from the dining room, walk out to the deck, and watch a couple of eruptions while you eat. The Old Faithful Lodge has cheap food and an ice cream shop on the way out.

This is the place that surprises parents. The canyon is 24 miles long, 1,200 feet deep, and the lower falls drops 308 feet — twice the height of Niagara. One blogger described looking out from Artist Point and "becoming aware that I was crying." It hits like that.

Artist Point is the iconic shot. Lookout Point gives you the same falls from a different angle. Inspiration Point and Grand View are on the North Rim Drive; South Rim has Artist Point. Drive both rims; the canyon looks different from each side.

Plan this for a "soft" day, not after a 6 a.m. Lamar drive. Kids who are already wrecked from wildlife dawn-watching will miss the moment.

The Serengeti of North America. Bison herds in the hundreds. Wolves on a good morning. Black bears and the occasional grizzly. Eagles, pronghorn, coyotes, sometimes a moose.

The catch: you need to be there at dawn or dusk. Animals bed down midday. From West Yellowstone or Old Faithful, dawn at Lamar means leaving at 4 a.m. From Mammoth or Roosevelt, it's a 45-minute drive at 5 a.m. — much more humane.

For under-6 families, swap Lamar for Hayden Valley. Hayden runs from Canyon Lodge area to Yellowstone Lake — bison herds + grizzly chances + a 30-minute drive from your room instead of a 2.5-hour drive. The wolves are mostly Lamar, but bison are everywhere.

If you're serious about wolves, hire a guide. A few parents flagged the same surprise: kids pay attention to a guide they aren't related to. A few hundred dollars buys a spotting scope you don't have and a guide who knows where the wolves slept last night.

The travertine terraces are beautiful in spring and early summer when water is flowing. By August, large sections go dry and turn into pale-grey rock. One blogger called Mammoth in mid-September "largely dry" and disappointing. Don't anchor a trip on the photos you saw if you're coming in late summer.

What still works year-round: the historic Fort Yellowstone buildings (former Army cavalry post), the elk who lounge on the lawn between buildings like landscaping, the upper-terrace drive loop (kids stay in the car, see the formations through the window), and the Albright Visitor Center museum (a 90-minute rainy-day save).

Mammoth Hot Springs Hotel & Cabins is the best in-park base for Lamar-heavy trips. The cabin oval has a grassy middle where kids run while parents grill. The Mammoth Clinic is on-site — peace of mind with little kids.

Two views, two experiences. The boardwalk takes you across the spring at ground level — you see steam, you smell sulphur, you might see the rainbow if the wind is right. The Fairy Falls overlook (a separate 1-mile trail uphill from the Fairy Falls trailhead) gives you the rainbow shot you've seen on Instagram. The overlook is the actual photo.

Most families do both. Boardwalk takes 30 minutes. Overlook is 45-60 minutes round trip. Combined visit: about two hours.

Parking at the main Grand Prismatic lot fills by 10 a.m. June through August. The Fairy Falls trailhead lot also fills. The move: arrive before 9 a.m. or after 4 p.m. The light is also better at those times.

The under-discussed quiet half of the park. Yellowstone Lake is the largest high-elevation lake (above 7,000 feet) in North America. Storm Point Trail and Pelican Creek Nature Trail both run from the Fishing Bridge area — Storm Point is the better kid hike (2.3-mile loop, marmots at halfway). Mud Volcano + Dragon's Mouth Spring (sulfurous, dramatic, kids either love or hate it) are 15 minutes north.

Lake Yellowstone Hotel is a different lodging story than the rest of the park. The cottages are basic (small windows, no fridge), but the main hotel dining room is the best in-park meal you'll get. The move some veteran families make: sleep elsewhere, eat dinner here once.

The quiet northeast corner. Tower Fall is a 132-foot waterfall viewable from a short paved overlook a couple of minutes from the parking lot — the trail down to the base has been closed since rockslides in 2004, so manage kid expectations: it's a look-from-above stop, not a hike-to-the-falls. Calcite Springs Overlook (5 minutes south) is a tree-framed canyon view that's almost always uncrowded. Petrified Tree (a single ancient redwood stub) is a quick stop.

The headline here is the Old West Dinner Cookout. Wagon ride or horseback ride from Roosevelt Lodge out to a creekside cookout — steak, beans, apple betty, cowboy songs. The wagon takes all ages (under-3s ride free on a parent's lap); the horseback ride needs riders 8+. Books out 13 months ahead with the lodges. Worth booking the moment your dates open.

Roosevelt Roughrider cabins are nearby — rustic (some have no private bath), but the closest in-park base for Lamar Valley wolves.

2.3-mile loop along Yellowstone Lake. Mostly flat. Lakeshore views, a section through lodgepole forest, and — the kid hook — a marmot colony at the halfway point. The marmots are tame enough that they sit on rocks while kids watch from a few feet away.

If the full loop is too long, do it as an out-and-back to the marmots and turn around (about 1.5 miles total). The trail commonly closes in late spring and early summer for bear activity — not bison, despite what older blog posts claim. Check at the Fishing Bridge Visitor Center the morning of your visit; the closures move week to week.

The anti-Old-Faithful. Same geyser drama (eruptions every ~3 hours, 35-45 feet high, with preliminary minor eruptions leading to a main show that can last up to 30 minutes), no crowd. The 2.6-mile trail follows an old service road through the forest, flat the whole way. Kids 3+ can do it if you carry a snack.

The trade: you don't know exactly when the geyser will erupt. Check the small wooden logbook at the geyser when you arrive — visitors record eruption times, so you can estimate the next one. Worst case you wait 90 minutes for the show. Best case you arrive five minutes before. Either way, the kids have the geyser to themselves.

1.2-mile loop around a small lake in the Lamar Valley. About 200 feet of elevation gain — all in the first 100 yards. Once you're at the lake it's flat. Otters live here and are often visible scrambling across rocks. Watch the lake itself — cutthroat trout are visible from shore in late spring.

The trailhead is small and easy to drive past. Park near the small turnout 1.5 miles south of Pebble Creek Campground on the Northeast Entrance Road.

2.4-mile out-and-back to a 70-foot waterfall, through the Biscuit Basin geothermal area. The trail starts on a boardwalk through the basin (steam, sulphur, kids stick to the boardwalk), then turns into a regular forest trail to the falls.

The geothermal opening means the kids see geysers and then go for a real hike right after — good combo. Mostly shaded, modest elevation. Pack the water; the boardwalk section gets hot.

About 5 miles round trip if you do the whole thing (closer to 5.4 with the overlook side trip) — but the Grand Prismatic Overlook is only the first mile. Most families turn back after the overlook and skip the falls themselves.

The trail is flat the whole way. The overlook section is uphill for about 200 yards through forest, then opens onto a wooden platform with the iconic Grand Prismatic rainbow shot below. The light is best mid-morning (sun lights up the colors) but the parking is easier early or late.

Two very short hikes for the days when you need a meltdown-recovery option. Wraith Falls is a half-mile round trip from a pullout near Mammoth. Moose Falls is even shorter — about 300 yards from the parking lot near the South Entrance. Both are real waterfalls. Both work for tired toddlers.

4.6 miles round trip with about 1,300 feet of elevation gain. This is a real hike — not a boardwalk, not a flat trail. Kids 6+ can do it if you bring snacks worth summiting for.

The reward is a 360° view from the top — Mammoth terraces in one direction, the Gallatin Range in another, the Yellowstone caldera spread south. Most families take 2.5-3.5 hours round trip. Older kids treat it as the "real hike" of the trip and brag about it later.