Aiport Transportation for the Adventuresome

Here are some more interesting ways than by Taxi to get from Logan Aiport to the Marriott, if the weather is fine and you have time to kill!

By Subway (T)

Outside your terminal, find the MBTA shuttle bus stop on the lower level.
Board a (free) bus marked "Subway" to the station.
Buy tokens ($1.25 each) or a 3- or 7-day pass at the station.
Go down the stairs marked "inbound" to the platform, and take the train to Government Center (4 stops).
Go upstairs to the Green Line platform. Take any "westbound" train one stop to Park St.
Go downstairs to the Red Line platform (direction: Harvard/Alewife). Take the train 2 stops to Kendall/MIT.

By Boat, Walking and Subway

Outside your terminal, find the MBTA shuttle bus stop on the lower level.
Board a (free) bus marked "Water Shuttle" to the boat terminal.
Take the boat to Long Wharf ($12? Even I can't figure out the website!).
Walk (0.8 mi total) up State St (becomes Court St) to end in Tremont St.
Take Tremont St left to Park St.
Enter Park St T station, take Red Line two stops to Kendall/MIT (direction: Harvard/Alewife).