Quasi-organized, bargain travel on customized, biodiesel-fueled buses, with built-in berths, that run from San Francisco to points across California and beyond, including Bay Area day tours to Russian River and Santa Cruz (from $40); three-day round trips to Mendocino, Yosemite or Death Valley (from $279); and three- to seven-day coastal trips south to Monterey, Big Sur and LA (from $299).