First, if you have no car you are screwed, public transportation here sucks. Humperdinks isn't that good, but will do in a pinch, only a few locations actually make beer though and its the same beers as Big Horn Brewing, CB & Potts and a few other places under different names around the US but the Greenville Ave location is the best and makes some original house beers. Two Rows hasn't made their own beer for 6 years, so I wouldn't recommend them either unless you want a Sierra Nevada Pale Ale sold (illegaly) under their house name. Uncle Bucks is touristy but near the airport so thats good I guess. Zio Carlos is much better than it once was, and has some good brews coming out now that they have a good head brewer, but it's in Ft. Worth. Gordon Biersch is good, but not Texan and that's it for brewpubs in DFW for now. Craft beer bars are everywhere, and the breweries around here are much more plentiful than brewpubs, all of which offer Saturday tours at varying times, and a few offer a tour during the week.
All you need to know about the Dallas beer scene, with every brewery listed including tour and tasting hours, and weekly event schedules.
http://www.beerinbigd.com/