What are some good things to do in Boston?

Go to a Boston Red Sox game.

Eat Baked Beans.

Walk the Freedom Trail; Boston is a gorgeous and historic city. :)

Freedom trial, Boston Common, go to the Museum of Science,New England Aquarium

Visit the Brattle Bookstore, the oldest continuously open bookstore in America (est. 1825) at 9 West Street, a little crooked cobblestone alley downtown, it smells like a bookstore should and is packed with ancient books, first editions, antique Americana. Walk around the Commons, especially the west end where there are some very old graves. Take the Red Line subway out to Cambridge and walk the Harvard campus, have coffee in one of the coffee shops on and around Harvard Square, sit at the same table as, perhaps, Emerson or Thoreau. Boston is a walking town, the streets and alleys crooked because they were built on the old cowpaths. Walk the Freedom Trail, Fanuille Hall, follow the events and discover interesting details of the Boston Massacre, have an ale in a pub that opened its doors before John Adams died. The alleys are clean, and very safe in the daytime, not like NYC.

Never been there, but I understand they have nice tea parties.