Great city.
Harvard Square is a nice place to visit. Good food out that way, though it is a bit of a hike from the airport.
I love the freedom trail. Don't pass up the graveyards. It sounds a bit weird to go look at the tombstones, but you will be amazed at the names you find. Stop in at Faneuil Hall for good eats and a fun atmosphere.
Catch a Celtics game (too bad the Sox aren't playing now!).
If you like seafood, Legal Seafood is awesome (delicious clam chowder) but a bit pricey ($25-40 a person or so). The baked lobster is incredible.
JFK Presidential library is nice, but far from downtown too.
Walking along the new Parkway where the freeway used to be is also neat. Lots of exciting projects underway there.
Don't drive in Big Dig tunnels!
