There may be no more enjoyable way to see Yosemite Valley than to ride a bike beneath its lofty granite monoliths. The eastern valley has 12 mi of paved, flat bicycle paths across meadows and through woods, with bike racks at convenient stopping points. For a greater challenge, you can ride on 196 mi of paved park roads—but bicycles are not allowed on hiking trails or in the backcountry. Kids under 18 must wear a helmet.