Ahjumawi Lava Springs State Park

This is not the most easily accessible state park in California, since you will need a boat in order to visit. However, it's worth the effort, especially to see the unique lava rock formations that were only created in the last two to five thousand years. The majority of this 5,930-acre park is covered in basalt lava tubes, which are now filled with water from the nearby freshwater springs of Big Lake, Tule River, Ja-She Creek, Lava Creek, and Fall River. This area has over 20 miles of hiking trails and three campsites where you can spend the night. Keep in mind that this land is shared with the Achomawai tribes, as well natural wildlife like deer, coyotes, and birds.