 Although skiing forms the foundation of the economy, other activities increasingly contribute to visitor numbers.Non-winter recreational and cultural activities such as fly fishing on the Fryingpan and whitewater rafting on the Roaring Fork, hiking near the Maroon Bells in the Maroon Bells–Snowmass Wilderness, enjoying the caverns and hot springs in Glenwood Springs, the Aspen Institute and Rocky Mountain Institute conferences, the Aspen Music Festival, and numerous other cultural events attract visitors year-round.Although the valley floor is largely privately owned, most of the surrounding highlands are within the White River National Forest and are another major source of recreation and tourism.