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.
Spend some time exploring Adams National Historical Park. The park is where several historic homes are located, including the birthplaces of John Adams and John Quincy Adams, and the United First Parish Church where both Presidents are entombed. Aside from the houses, there are plenty of attractions to see at this park so sign up for a tour or go on an excursion of your own.
Set sail to see some of nature's most regal creatures on a New England Aquarium Whale Watch expedition. This tour will take you onto the waters east of Boston aboard a high-speed catamaran, and on your excursion you'll see humpback, finback, minke, and pilot whales, along with dolphins and other marine life.