[Noah930]

If this is your first time in Boston, I'd second ken's advice. The Freedom Trail is a walking tour of Boston. It'll take you through the downtown area fairly well. Other than the financial district, there are always people around all over downtown.

I think the Dodgers are playing the Red Sox this weekend. If the series is in Fenway, it's a pretty neat thing to take in a game.

German car day at Larz Anderson is OK. You can do it in an hour or two. Not sure how'd you get there, other than by cab. Public transportation there won't be as straightforward as it sounds. (edit: I see you have a car, so just drive right up and park on the road in front of the museum lawn.)

Ferry ride to Provincetown is actually pretty relaxing. Again, if you don't have a car, getting to (and around) the Cape will be a bit difficult. There's a bus (Plymouth & Brockton, aka "the P&B") that'll take you from South Station to Hyannis. But I don't know how you'd get around the Cape after that. (edit: 'Cause you have a car, driving to the Cape is about 50 miles. Then you cross the bridge, and it can take a couple hours to get all the way to P-town. 6A is the more scenic route along the Cape. Several villages to stop by along the way.)

Or you can drive up to Rockport to look at the artist colony up there and get a feel for a New England fishing village.

Laconia's got bike week, but it's a bit odd to be there and not riding, IMO.