Portola Redwoods State Park has a rugged, natural basin forested with coast redwoods, Douglas fir and live oak. Eighteen miles of trails crisscross the canyon and its two streams, Peters Creek and Pescadero Creek. A short nature trail along Pescadero Creek introduces visitors to the natural history of the area. Visitors can see clam shells and other marine deposits from the time when the area was once covered by the ocean. The park has one of the tallest redwoods (300 feet high) in the Santa Cruz Mountains.