It wasn’t long ago that most ski resorts became ghost towns come the warmer months. These days, though, there’s a boom in summer recreation on the slopes at winter resorts. Ski areas are building bike parks, zip lines, and even mountain-based rollercoasters to take advantage of their ski lifts, and mountain resort base areas are abuzz with attractions like waterparks, disc-golf courses, and farmer’s markets. It’s family fun of the most active kind. And business is booming: At world-renowned ski area Whistler-Blackcomb, for example, summer visits now surpass those in winter. If you’re looking for a summer getaway that features stunning scenery, tons of activities, and plenty of mountain town chill, here are four mountain resorts to know.

1. Jackson Hole Mountain Resort

Jackson Hole’s signature red tram cars have been hauling summer sightseers 4,139 feet to the summit of 10,450-foot Rendezvous Mountain for decades. But now the Wyoming resort has far more than that to offer once the slopes turn green. Your kids can still grab one of the resort’s famous waffles at the top of the tram, but now you can have them burn off the sugar in the resort’s bike park, on the aerial ropes course, or on the Via Ferrata. First constructed in northern Italy to help WWI soldiers move safely about the mountains, a via ferrata (“iron way” in Italian) consists of steel rungs and cables fixed to the sides of sheer mountainsides. Set on cliffs atop the Bridger Gondola, at Jackson Hole’s via ferrata, participants older than 12 can hire a guide, rent a harness, and experience the thrills of alpine rock climbing without the difficulty. One of the few such courses in North America, the Via Ferrata boasts 14 separate routes.

For kids too young for the climb, the Aerial Ropes Course at the resort base presents a thrilling set of challenges like balance beams, wobbly bridges, and cargo nets, all set 25 feet above the ground. There’s also no minimum age for Jackson Hole’s world-class lift-serviced bike park. Rent a bike and load it onto a lift to access 14 jump-and berm-studded trails ranging from the cruisy Buckaroo to the expert-only Dirty Harry. It’s not all spills and thrills, though: Kids aged three to 12 can sign up for the Grand Adventure camp at the Kids Ranch every Monday-Friday and have access to an array of attractions, including the bungee trampoline, rock climbing wall, pathway bike rides, and art and…