Downtown and east Austin is where most of the homeless live- not really a threat but lots of hands out. I think you will find the most friendliest and weirdest people there as their motto is "keep Austin weird".
I have an older brother that plays lead guitar in a German band near there- here is the site- My father is a US Federal Marshall there so if you get drunk and thrown in the cage have my brother call him-lol
http://www.walburgrestaurant.net/
He is the fat bastard on the end- you will be there during their oktoberfest and if you go make a reservation. Good food and good music too.
Sixth street gets crowded at night but you can easily walk from one bar to the next for miles to find your type of music.
As far as BBQ goes Stubbs (good music and great bbq-srv used to host there) The green mesquite, the salt lick and franklins (watch the line there and they close early because they always run out).
Lamar street, Guadalupe and Congress st are cool places to visit and Lake LBJ, Town Lake and Lake Travis are cool too-(hippy hollow at Lake Travis is a nude beach).
The Broken Spoke is legendary for good bands as is The Continental Club.
If you like Jazz try The Elephant Room just off sixth.
If it gets too crowded on sixth one of my favs was Pearls Oyster Bar off the strip.
Check out the State Capital too as it is bigger than the White House--Of course Everything is Bigger there.--I remember them flushing their swimming pools--:rofl_200: Enjoy