While you're hanging out in the Boston Public Garden, take a ride on the city's signature Swan Boats. The boats are the only ones of their kind in the world and they float the waters of the Public Garden lagoon. A ride on one of these boats is the best way to see all of the attractions in and around America's first botanical garden.
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.