Where are you moving from? Austin, in my opinion, is a good sized town without the large city feel. There is a big variety of things to do. From 6th street (bars, clubs, live music) to the tredny parts around congress and the UT college campus. Zilker park is near downtown with some nice views of the city, which has a variety of activities too. A running trail follows the river that runs through town. You can rent canoe's and kayak's and paddle the river. Barton springs is a natural spring that’s popular to visit and swim in year round. Live music again is big in Austin. Austin City Limits (ACL) and South by South West (SxSW) are two big yearly festivals. As for the bats, another popular attraction, these can be seen just after sun down at the Congress Ave bridge (as it passes over the river) with a nice view of the State Capitol building right down the street (which is open for tours also).
Traffic isn't terrible with two highways that parallel town, Interstate 35 on the east and loop 1 (also known as MoPac) on the west side of town. In my experience MoPac flows a little better but rush hour traffic only seems to last a couple hours before it starts to thin out. You feel the difference too when school is not in session. I would say traffic is probably a little heavier between downtown and the north side of town. I never feel like I am going out of my way traveling between North and South Austin. The airport is just east of the city and is a quick drive into town. To me (born and raised in Austin) North and South side of towns do have a different feel that’s hard to explain. The North has really expanded a lot in the past 10 years, brining lots of shopping areas and apartments, where as South Austin I guess has a little more suburb feel… West of town is more ‘hilly’ as you start to enter the Central Texas Hill Country, with the east side being more flat, as you knew.
Hope that helps a little. If you have any questions I will try to help. Oh, and you won’t stand out too bad at 6 ft…