Behind their building is a large free-parking lot with a narrow (hard to see) driveway to access it. Do not enter the train station lot unless you're prepared to pay for parking.

Thrillist.com's Boston branch just came out with their list of Boston's best seafood places.  Haven't been to all on the list, but most are well-known.  My pick would be B & G Oysters.  Barbara Lynch (of No. 9 Park and Menton fame) can make bath water taste great.