05/31/2026
Since 1634, there has been a fort at Castle Island for the defense of Boston. It’s now part of an oceanside park with trails connecting the entire fort by land. The Department of Recreation and Conservation maintains the beach, the bathrooms and the Head Island Causeway that creates a walking loop around Pleasure Bay: Castle Island to Head Island to Carson Beach and back to the free-but-packed Castle Island parking lot.
You can swim, picnic, stroll, fly a kite or just look at the ocean any time of year. Get there early enough you’ll be with a number of Bostonians coming to see the sun rise with you. Stay and get a tour of Fort Independence with the Castle Island Association.
Historic Boston Inc. - HBI Boston Harbor Islands National and State Park Boston Harbor Now Save the Harbor / Save the Bay