I got a lot of these from the BU guide, but filtered out the things I've already done/don't care to do.

• Blue Man Group
• Hatch Shell
• Eat real Boston Clam Chowder
• Take the Freedom Trail
• Go to the Boston Symphony Orchestra
• Hold someone's hand while walking in the snow
• Explore Beacon Hill
• Visit the Boston Tea Party Ship and Museum
• Attend a Boston Ballet
• Visit the 50th floor of the Pru
• Go ice skating on Frog Pond
• Go to the New England Aquarium
• Sail the Boston Harbor
• Iprov Asylum
• Spend an entire afternoon/evening at Faneuil Hall and Quincy Market
• Eat at Finale
• Check out Coolidge Corner
• Watch a Red Sox game
• Comedy Connection
• Border Café
• Sail on the Charles
• Rummage through Haymarket
• Isabella Stewart Gardner Museum
• Lyric Stage Company
• Harvard Square Oktoberfest
• Watch the lighting of the Boston Common Tree
• See the New England Holocaust Memorial