6th street is awesome...cool clubs/nice parks/beautiful scenery/great restaurants/............also there is a great restaurant called Twin Peaks in Round rock{http://www.twinpeaksrestaurant.com/AUSTIN.htm}
Hey Natural, when you get back home let me know what you great spots you found! I myself have intentions on going to Austin this summer. Last time I came down all I got to do was pick up my birth certificate and shopping with Tiffany, ugh!
It really depends on your interests. If you like music, there are A LOT of venues around town that cater to an ecclectic crowd...something for everyone! If you like the outdoorsy stuff, there are some great places to go but that, too, will depend upon the weather, etc. There are some artsy fartsy things to do all over town as well...and then the typical shopping malls, movie theatres, etc. So, good food and lots of variety...great venues to suit most any taste...fun places to go dancing...caves to crawl in and out of...lakes to troll...trails to follow...and you get my point!