Castle Island is located on William J. Day Blvd. in Boston, Massachusetts. Connected to City Point Beach and Pleasure Bay Beach, the 2.2 mile loop is perfect for running, strolling, relaxing, people watching, or taking in the view from one of the many benches throughout the park area. On the grounds you’ll also find plenty of grass, picnic tables, and historic Fort Independence, which is great for guided tours or self-guided exploration. The coarse pebbled beach area is small; walking to the water is gradual, and the waves are gentle to non-existent, great for kids. Castle Island provides a full day of activity for families as well as a historical element.