The sugar-white Crescent Beach curves for 3 1/2 miles down the entire western shore of Marco Island. Its southern 2 miles are fronted by an unending row of high-rise condominiums and hotels, but the northern 1 1/2 miles are preserved in Tigertail Public Beach (tel. 239/642-8414), at the end of Hernando Drive. Restrooms, cold-water outdoor showers, a children's playground, watersports rentals, and a snack bar are available here. The park is open daily from dawn to dusk. There's no admission charge for the beach, but parking in the lot costs $3 per vehicle. The beaches in front of the Marriott, Hilton, and Radisson resorts have parasailing, windsurfing, and other watersports activities, all for a fee.
If you're not staying at the big resorts, Collier County maintains a $3-per-vehicle parking lot and access to the developed beach on the southern end of the island, on Swallow Avenue at South Collier Boulevard.