Mammoth Lakes, California Adventures 4x4 Off-Roading Discover a California panorama beyond the imagination of those who stick to the asphalt by going on an off-roading adventure. There are high mountain lakes, shadowed canyons, giant boulders guarding ice-cold streams, dense forests of tall timber and austere, high-desert plateaus, all yours to explore. Mammoth has extensive back trails for off-roading with maps available through the visitor’s center.