Fort Independence, a pentagonal five-bastioned, granite fort built between 1834 and 1851, is the dominating feature of Castle Island. This 22-acre urban park is connected to the mainland by both pedestrian and vehicular causeways. Pleasure Bay, the M Street Beach and Carson Beach form a three mile segment of parkland and beach along the South Boston shoreline of Dorchester Bay. Carson Beach offers some beautiful views and great public amenities: a rehabilitated Mothers' Rest, public restrooms, exhibit space, first aid and lifeguard functions, while the outdoor courtyards allow space for passive recreation. Carson Beach also features a walkway which allows one to walk, bike, or run along the water's edge from Castle Island to the Kennedy Library.

Fort Independence and Castle Island are on the State and National Registers of Historic Places. Fort Independence is open from Memorial Day to Columbus Day, hours vary. Fort tours are conducted by the Castle Island Association in the summer months and there is interpretive signage for self-guided tours. The principal program theme, the History of Castle Island, stresses the role of the fort in harbor defense.

Activities

Swimming
The island and connected beaches allow for plenty of shoreline to take a dip into the ocean.

Walking
For a light walk around historic Fort Independence, take the Castle Island Loop. For a longer stroll, try the Pleasure Bay Loop.

All Activities at Castle Island, Pleasure Bay, M Street Beach and Carson Beach
Biking
Educational programs
Fishing
Running and walking
Swimming

Facilities at Castle Island, Pleasure Bay, M Street Beach and Carson Beach
Boardwalk
First aid station
Lifeguard station
Picnic areas (grilling allowed)
Playground
Restrooms
Rinsing showers
Scenic overlook