Part of a largely undeveloped area, Petrolia offers a wild coastline with remote beaches. There is no shoreline highway to take, and the roadways there are steep. For those who take the trip, though, the rewards are breathtaking. Don’t expect a quiet stroll on the beach at Mattole River Beach, for the terrain is rugged and unpredictable. Hike through the unforgiving gravel-like beach of Punta Gorda Beach to reach the old Punta Gorda Lighthouse, or head to Cape Mendocino, California’s westernmost site.