The hill is a leftover of Lake Bonneville, a spit of sand and gravel that waves piled against the Traverse Mountains. Pilots have been using it a long time: the University of Utah Flying Club launched gliders off it in 1927, and today around 700 pilots fly the site each year, close to a third of them from out of state or another country. Watching costs you nothing but a parking spot at 5,146 feet, and there is a radio-control modelport just west of the lot.
Do this: Watch or learn to fly, kite flying
Family note: Watching paragliders launch never gets old
Fees and hours: stateparks.utah.gov
Add to the trip: Bells Canyon Waterfall (Hike, 10 mi) · Battle Creek Falls (Hike, 12 mi) · Granite Flat Campground (Camping, 14 mi) · Mount Timpanogos (Timpooneke) (Hike, 14 mi)