Wild rivers are the lifeblood of Idaho, and what a star-studded list — the Snake, the Selway, the Payette, the Salmon — known far and wide by rafters, kayakers and anglers. They flow through a state lightly populated yet dense with beauty, perfect for a camping vacation. The aptly named Sawtooth Range slices through Idaho’s midsection, where Sawtooth National Recreation Area campgrounds offer classic mountain scenes of alpine lakes and wildflower meadows. Near Arco, Craters of the Moon National Monument and Preserve showcases cinder cones, deep fissures and lava tubes left behind by ancient volcanoes. Volcanic activity also accounts for the state’s many hot springs.