Fodor's Expert Review Mammoth Lakes Basin
Mammoth's seven main lakes are popular for fishing and boating in summer, and a network of multiuse paths connects them to the North Village. First comes Twin Lakes, at the far end of which is Twin Falls, where water cascades 300 feet over a shelf of volcanic rock. Also popular are Lake Mary, the largest lake in the basin; Lake Mamie; and Lake George. Horseshoe Lake is the only lake in which you can swim.