Set in a broad valley midway between Tecate and the I-8 freeway, tiny Campo (pop. 2,684) has one main attraction, the Pacific Southwest Railway Museum (619/478-9937, Sat.-Sun. and holidays 9am-5pm, $5 adults, $2.50 children), at the west end of town on Forrest Gate Road. Along with an extensive outdoor collection of old locomotives and carriages, the museum offers train rides (11am and 2:30pm, $15 adults, $5 children) on restored steam- and diesel-powered trains, including a 12-mile round-trip through the surrounding countryside. Campo also marks the southern end of the Pacific Crest Trail, which winds for 2,650 or so miles between Canada and Mexico.