Boston city tour with airport drop off

[Grandmaanne7]

11 of us will be ending our cruise in Boston. Our flights don't leave until 3:30 and 4:00. The ship's excursion is expensive and doesn't sound overly exciting. Are there any recommendations for a reliable, reasonably priced service that could handle 11 people and their luggage and provide an interesting 3 to 4 hour tour with airport drop off? We are a multi generation group with a variety of interests so hopefully not hard to please. 

[Nitemare]

I'd just tour on my own, it's an easy city to get around in.  Get downtown, use any of the online luggage storage services, or offer a bellman at a hotel a nice tip to store all your bags.

 

You can also buy a ticket on the Rowes Wharf Ferry that goes to the airport and they will hold your bags all day for you included in the fare