Head out on a Boston Lobster Tour to fish for lobster and learn about the Boston Harbor. Along with a narrated history of the area, you'll get to see lobsters, sea urchins, star fish, and crabs up close. Bring your camera because your trip on the water offers some pretty great views of the city.
Spend some time hanging out in the country's oldest park. The 50-acre Boston Common is the anchor for the Emerald Necklace park system and is the starting place of the famous Freedom Trail. There are quite a few monuments throughout the park, and several outdoor events take place in the Common throughout the year.