El Loco

As the largest indoor theme park in America, Adventuredome at Circus Circus already packs in families for rides like the Sling Shot, which shoots up like a 4G-force rocket launch. But since December 2013, El Loco lets riders experience a negative 1.5 “vertical-G” when they climb 70 feet before dropping over—and under—backward. Tip: Eat your funnel cakes after the ride. $5-$8 per ride; day passes cost $16.95.