I went to Boston in 2011, the last time the Brewers played there. Fantastic city, fantastic ballpark, if you get a chance to go, do it. There were a ton of Brewer fans there, to the point we were asked by multiple Boston fans why so many Brewer fans made the trip, they were comparing it to how Yankee fans travel to Boston. Though since the Brewers are visiting for their home opener, it may be tougher to get tickets.