The Crystal Cove red route hike is the toughest hike that the park recommends, calling it “a strenuous loop hike around the permitter of the park.” The hike doesn’t include a big mountain climb, but rather is a series of ups and downs through pristine native coastal scrub, a rarity in Southern California. The red route is well marked and easy to follow, there are bathrooms along the way, and it offers lots of opportunities for wildlife spotting and expansive ocean views.