Redwood National and State Parks, Calif.
The tallest trees in the world live here. But make no mistake: As majestic as these old-growth redwood groves are, there's a lot more to see! Check out expansive prairies, two rivers and almost 40 miles of rugged coastline. Situated on the northern coast of California and Oregon, Redwood National and State Parks enjoy an extremely moist climate. We advise taking warm, weatherproof gear when you visit.
There are four campgrounds here -- one is on the coast and three are in the redwood forest. Cars and RVs are permitted, and reservations are strongly recommended, although all campgrounds operate on a first-come, first-served basis.
If you'd rather have a more primitive experience, consider backcountry camping, which is allowed only in designated backcountry campsites. There are 200 trails that will take you out into the wild to get there. Go on foot, horseback or bicycle. There's no backcountry registration system like many other national parks, but some areas may require a permit, which is free.