Spend some time playing on the Charles River. Enjoy some water recreation by renting a kayak, canoe, or paddleboard from Charles River Canoe & Kayak. The company also offers kayak tours of the river and the Boston Harbor.
Journey to the center of the Earth at Boston's Mapparium, a large attraction housed at the Mary Baker Eddy Library. The Mapparium is a three-story, painted-glass dome with a glass bridge stretching across the “globe”, allowing visitors to stand in the middle of the Earth. The lovely structure is illuminated with LED lights during the presentation of A World Of Ideas, which is basically an exhibition global history.
Watch the opening battle of the American Revolution take place right before your eyes at Minute Man National Historical Park. This hallowed ground is where the war began and where it is relived through reenactments. These demonstrations aren't the only things to do at the park though; explore the visitors center, walk down Battle Road Trail, check out the Hartwell Tavern and The Wayside and other park attractions.
Head to the Back Bay Fens and hang out next to a beautiful freshwater marsh. Along with the marsh, this link in the Emerald Necklace park system is home to ball fields, a wartime “Victory Garden” that was established in 1941, and the popular Kelleher Rose Garden, among other outdoor attractions. While you're exploring the park, be sure to pay respects at the World War II, Vietnam, and Korean War memorials that reside in the park.