Humboldt Redwoods State Park encompasses nearly 53,000 acres, of which over 17,000 are untouched old growth coast redwoods. Created in 1921 with the small Bolling Memorial Grove the park has grown over the years to include a diverse ecosystem including the entire Bull Creek watershed and the Rockefeller Forest, the largest remaining old growth redwood forest in the world. This is the third largest California State Park and protects an environment unique to anywhere else on earth. A wide variety of activities and facilities are available. There are over 250 family campsites in three different campgrounds, plus environmental camps, group camps, trail camps, and a horse camp. Over 100 miles of trail await exploration by hikers, bikers, and horse riders. The South Fork Eel River provides fishing, boating, and swimming opportunities, and there are many day use areas for picnicking, family activities, or for just enjoying the pristine environment. Some favorite locations include the Founders Grove Nature Trail, the 32 mile Avenue of the Giants Auto Tour, and the Humboldt Redwoods Visitor Center. The Visitor Center offers a wide variety of fun and educational exhibits and activities, including a theatre, displays, a bookstore, and the famous Kellogg Travel Log. Auto Tour brochures are available at either end of the Avenue of the Giants and at the Visitor Center. During the summer season interpretive activities including nature walks, Junior Ranger programs, and campfire programs are held daily.