Hiking McCullough Gulch! Here you can hike to a waterfall. It is about 3 miles round trip. If you keep going you get to a gorgeous lake. The lake is about 4 miles roundtrip and almost 900 feet elevation gain.
It is important to note that parking up here is changing. Parking at Quandary and McCullough Gulch have gotten out of hand. People parking on the roads, in peoples driveways, in front of “no parking” signs, etc.. So you now can only park at the Quandary trailhead if you reserve a spot and pay a fee. HOWEVER, there is a free shuttle from the airport lot in Breckenridge.