Adventuredome

Adventuredome is a five-acre indoor theme park under the pink glass dome behind Circus Circus, and it's still the only full amusement park in Las Vegas. Two legitimate roller coasters anchor it: Canyon Blaster, the world's largest indoor double-loop, double-corkscrew coaster, hitting 55 mph like it has since 1993, and El Loco, a compact 2014 machine with a steep drop and hard-banked turns. Around them sit a spread of smaller carnival rides, laser tag, an 18-hole mini golf course, a climbing wall, a 4D theater, and rows of midway games. Walking in costs nothing — you pay per ride or buy an all-day wristband.

The park opened in 1993 and doesn't hide it: worn edges, arcade din, and on any given day a ride or two down for maintenance. Climate control is the real headliner, though — when the Strip is pushing 110°F, this is the one place a kid can burn energy for hours without melting. It's built for families with children under 12 and for coaster fans collecting the two credits; adults without kids will see everything worth seeing in about an hour. Factor in the location, too — Circus Circus sits on the quiet north end of the Strip, a long walk from center-Strip resorts, and midweek hours shrink outside the summer season.