21st bday in Boston

[chuckwhoolery]

Me and my friends are barhopping in boston for my 21st, any suggestions of good bars to hit up...or for that matter suggestions for the 1st legal beer in a legit bar? I chose fosters for my first legit beer in a restaurant if that helps.
my thoughts so far:
have to hit cheers/jillians
possible beers:
killians irish red, samuel adams boston lager, guiness (I just dont want the 1st one to be a random I already drink all the time like Heinekin or sierra nevada
possible mixed drinks:
irish carbomb, jack/coke, random bartender suggestion

gogogogogogo