Sebastian is known less for what happens on its beach than off it (hint: Surf's up!). Bring your board; this is one of the premier places in Florida to surf. When the waves are rolling in, Sebastian's "Monster Hole," about a third of a mile offshore south of the inlet, breaks the waves just right for a long ride. Look for more good surf action immediately north of the inlet.
Families who don't want little ones to contend with waves can watch them frolic in "The Cove," a protected, gently sloping pool of water north of the inlet.
Away from the three-mile stretch of pristine beach are a milelong nature trail and a 6 1/2 -mile Volksport path. They lead visitors over the jetty, down the beach, across the dunes and around The Cove before joining a paved walking/bike trail on the park's north side. Fishing is a popular pastime here, with fishermen casting from the park's pier and jetties.
Tent and RV campsites ($28 per night) are situated along the inlet on the shores of the Indian River Lagoon. You can bring a motorboat or rent one -- or a canoe or kayak -- at the park's marina.
There are two museums within the park. The McLarty Treasure Museum, at the park's south end, shows off salvaged treasure from the 1715 Spanish Plate Fleet, which was wrecked off the coast during a hurricane. The Sebastian Fishing Museum, south of the inlet, celebrates the area's fishing tradition by showcasing such items as a handmade fishing boat and historic fishing gear.