Dave,
Check out The Oasis restaurant that overlooks Lake Travis. A meal there at sunset is akin to being in Malibu during a Pacific Ocean sunset. If we can work out a deal with them to do a dinner there it would be amazing. They also have plenty of parking outside and could likely turn it into a full event (as in local car show) if we could work it out with them and give enough notice.
Also, my good friend is on the police department there and could maybe help out with logistics for other events (no guarantees on forgiving top speed runs...).
In case you can't tell, I really like that place and almost moved there before coming to SoCal -- and still see myself ending up there someday...
Let me know if I can be of any help. As mentioned, Bee Cave road is a great cruiser. Pretty scenery and plenty of wide, sweeping turns. We should also schedule a Congress Street Bridge run at sunset on one night. That's when the place gets literally "batty" as thousands of bats fly out from under the bridge and stream into the evening sky to keep the city insect free (yet another reason i like it). Do a google search and you can learn more about it.
Great place for the rally!!!