Happy Isles Fen Boardwalk is a 0.08-mile out-and-back foot trail in Yosemite National Park, California. It is essentially flat, with a high point of 4,031 ft. Difficulty: easy, from the NPS hiking-rating formula.

Open Happy Isles Fen Boardwalk on Trailbound's interactive map to see the full route, the elevation profile, today's forecast and any park alerts for Yosemite. Yosemite has permits or reservations for some areas: see the Yosemite page for what's needed.