Well, if you're looking for bass suggestions Bass Emporium on Anderson Lane should be your first stop. Guitar Rez off Lamar will sometimes have some cool basses, but they generally have quite a few cool pedals.
In terms of music venues, there's a ton, but some of the more famous ones are Antones, the Continental Club, the Saxon Pub and Stubbs....depending on your musical preference. In terms of night life, E 6th has bars virtually lining both sides of the street that generally cater to college kids. The bars/clubs on W 6th attract the 25-35ish crowd. You'll also find that most neighborhoods have one or two local "dive" bars, if you prefer that sort of thing...I know I do!
I could go on and on, but this post is long enough already. Feel free to ask any specific questions. Oh yeah, I think the BBQ place mentioned earlier is Salt Lick.
dee