Named for its 6,000-foot glacier-polished crags, which were formed by volcanic activity centuries ago, this park offers fishing in Castle Creek, hiking in the backcountry, and a view of Mt. Shasta. The crags draw climbers and hikers from around the world. The 4,350-acre park has 28 miles of hiking trails, including a 2¾-mile access trail to Castle Crags Wilderness, part of the Shasta-Trinity National Forest. There are excellent trails at lower altitudes. Camping is allowed in winter on a first-come, first-served basis.