(Swimming is allowed inside the buoy lines at the five designated swimming beaches. The cost is $2 for walk-in, $5 per vehicle or $20 per bus. There is no fee charged for children under the age of 16.  Golden Age/Golden Access or America the Beautiful Card Holders pay 1/2 of posted fee.  An annual pass may be purchased at the Visitor Center for a fee of $40 good for one calendar year from the date of purchase.)