If you are looking for massive, 2,000-year-old trees that will dwarf your car and/or RV, this is a great option. Established in 1929, the Jedediah Smith Redwoods State Park is a predominantly old-growth coast redwoods park. The Park has a visitor center with exhibits and a nature store, a campground with 87 family campsites, nearly 20 miles of hiking and nature trails, and access to Smith River (the last major free flowing river in California).
The Park protects 10,000 acres of primeval redwood groves as well as an undergrowth of azaleas, rhododendrons and ferns. It is open year-round, with summer temperatures ranging from 45-85 degrees Fahrenheit and winter temperatures ranging from 30-65 degrees Fahrenheit.