There are tons of sites for backcountry camping throughout the park. These are primarily situated around Dewey Lake. I have never actually stayed in the camping facilities as it's always seemed more fun to go "off grid" and visit a more private site. Be warned, the lake is gross. People using house boats are known to dump waste directly into the lake. If you don't plan on diving in and would rather just fish and hike, make time to take a trip here.