3-4 nights at 6-12 is the Las Vegas sweet spot. Two days dosing the Strip — pool mornings, the aquarium or the indoor amusement park in the heat, the fountains at dusk, a family show — and one or two days out in the desert. That rhythm gives you the spectacle without the grind and sends everyone home happy.
The desert-forward version is the one most families underrate. Flip the ratio: one day on the Strip, two or three days out at Hoover Dam, Red Rock, Valley of Fire, and the Grand Canyon, using a Strip or off-Strip pool as the base. If your kids are 8 and up and into the outdoors, this is the better trip, and it sidesteps most of the adult-Vegas stuff entirely.
Under 3 is workable but small. It's a pool-and-children's-museum trip, not a Strip trip. Stay somewhere with a great calm pool, do the Discovery Children's Museum and Springs Preserve, dose the fountains for five minutes, and keep the ambitions low. Nobody under 3 needs Las Vegas — but if you're going anyway, that's how you make it pleasant.
Teens get the most out of Vegas: the Sphere, the coasters, Area15, the night-Strip energy (with you), the full Grand Canyon day, the food. It's one of the better teen-family cities in the country, precisely because there's so much for a 15-year-old to actually want to do.
The 2026 cost reality. A family of four on a 3-night Strip stay — mid-tier room plus the resort fee and parking, the aquarium and the indoor park and a show, a couple of desert days with a rental car, and food — runs roughly $1,800-3,500. The fees and the food are where it adds up faster than you expect; the desert day trips are some of the best value in the whole trip.
And the question everyone really asks: is Las Vegas even okay for kids? Yes — with conditions, and with your eyes open. Six and up is ideal. Plan around the heat. Treat the desert as the main draw, not the afterthought. Steer the late, adult Strip around them. Do that, and here's what happens: the kids remember the lazy river, the shark tunnel, the glass bridge over the canyon, the desert turning red at sunset. You remember the fountains, and the bill. That's the trade, and for a lot of families it's a good one.