Off-trail riding is dangerous, damages vegetation, and can injure wildlife. Because of the steep incline of the road to Mirror Lake and the trail to Lower Yosemite Fall, and because many pedestrians walk on these routes, rental bicycles are not allowed. Cyclists are asked to park their bikes at the bottom of these hills and walk to the lake and to the falls. In early summer, rental rafts, complete with life jackets and paddles, are available at Curry Village. Due to hazardous rapids and park regulations, do not raft on the Merced River above the Yosemite Valley Stables or below the Cathedral Beach Picnic Area.
Swimming is available at the Curry Village and Yosemite Lodge swimming pools.
Use extreme caution when in the Merced River as water temperatures can be chilly and the current can be deceptively swift. Do not swim above or near waterfalls or rapids. Swimming in these areas has resulted in several deaths over the years. Yosemite National Park offers some of the world's best rock climbing on clean rock surfaces. It is no coincidence that the Yosemite Mountaineering School and Guide Service is also among the better rock climbing schools.