Grassy Key Sandbar, also known as Valhalla Sandbar, is located just east of Marathon next to Grassy Key. Boasting a clean, shallow sandy bottom and calm waters, this is Marathon's most popular sandbar destination for boaters looking to relax and socialize.
Crowd patterns show up here once boaters start reporting conditions at this spot. Be the first.
Sequence a smart, multi-stop boating itinerary built around this location.