Nature Center at Happy Isles, Yosemite National Park

If you want to learn about the flora, fauna and geology of the Yosemite Valley, this is the place to visit. Created with both children and adults in mind, the center has both static and interactive displays on the area's natural history. Nearby you can explore four short trails, each one devoted to a different ecological niche: forest, river, talus and fen. The center also has a good bookstore, geared toward exploring the nature of the valley. Admission to the center is free.