Dh and I just took a long weekend in Chattanooga last month. I have been in the past, but he had never been. You didn't specify if you have children or not. It was just the two of us and we had an excellent time, but we are pregnant with our first and I kept saying over and over "I can't wait to bring our children here".
I say do Rock City and Ruby Falls for sure. They are touristy, but still pretty cool. I agree w/ the previous person who said that the kids will really enjoy these attractions.
The aquarium is another can't miss attraction.
We stayed at the Marriott Convention Center which is right downtown. They had a package deal that included Aquarium, Imax, and all 3 Lookout Mtn. attractions, plus your room and breakfast. There were several different packages to choose from at this site
http://www.lookoutmountain.com/packages.htm
Also there is a free electric shuttle service downtown that makes a loop from the ChooChoo to the Aquarium and makes stops along the way. There is a stop right outside the Marriott and another one at the Days Inn just across the street. I'm sure there are other hotels that are convenient to the shuttle, but we didn't see any as obvious (but we didn't go all the way to the Choo Choo either). It was a really nice convenience to not have to drive and park downtown. I was surprised that I had not seen this advertised anywhere.
There are tons of great restaurants in the downtown area too. I found a nice list of the restaurants and attractions at Chattanoogafun.com
One last thing if you are there over a weekend and have any time at all on Sunday I highly recommend that you go to the Chattanooga Market (Chattanoogamarket.com). It is held under an open air pavilion. There are arts and crafts booths, food, and really enjoyable bands. The hold it every Sunday from 11am til 4pm. We went and spent about 3 hours there, mostly just relaxing listening to the bands. They have various special events and the bands change weekly.
I think it is a great place for a vacation. You can take it easy and relax or go, go, go all day. Which ever pace suits your mood for this trip.
Hope you enjoy it!!
