Jump on I-75 north and head to Chattanooga. We haven't been to the aquarium in a long while (too expensive with three kids) but there is lots more to do in Chattanooga beyond the aquarium. We love going to Coolidge Park with it's free sprayground its great summer fun. Right next door is one of the oldest hand- carved wooden carousels. It's really beautiful and the kids have fun finding the flying fish and the eagle, much more beyond your typical horses. And get this...it's only 75 cents!
We used to go to Cheeseburger Cheeseburger for lunch where the kids could their get lunch in a car, but now we've recently discovered a place we like better- River Street Deli. They have delicious sandwiches and spreads. Their pimento cheese is not to be missed. My middle child is especially partial to their peanut butter, honey and banana sandwich (and somehow Daddy always seems to extract a bite or two).
If you want to make a whole day of your Chattanooga adventure, you can always add on a game at the minor league baseball park. The Chattanooga Lookouts play near downtown Chattanooga and seats can be purchased for as low as $2! How's that for a family fun adventure?