For those who want to enjoy a local bar crawl, come to Moody Street in Waltham. You can start on one end, go up the street, then come down the other end. Starting from the river, you've got Margaritas, then Bison County and Iquana Cantina. There's also "L" further up the street. Cross over to Tempo for a nice martini, and then down to Solea for some fantastic sangria.

Some of bigger bars (Skellig, Watch City Brewing) have closed since this was originally written...but the Gaff and Joco's are great choices too.  They are cozy, local Irish pub-like places with a nice selection of brews.

There are certainly others in between, but these are the places you don't want to miss. If you're still thirsty, go back in reverse. Cheers!