Ok I live in Chattanooga and I help with this leg of the trip. I-24 to I 75 is a easy driving through Chattanooga only thing say to avoid is early in the morning it has a little bit of traffic but not much. Now for hotels I would stay in Downtown Chattanooga. The Courtyard by Marriot, Hilton Garden, Residence INN by Marriot is the new hotels and very close to resurasts, tourist attarctions and baseball park own the downtown free shuttle route. The tourist attactions I would do is IMAX Theater where I work at. Then go across the Street to Aquruiam which also I work at to. Also the hotels is a baseball park near the hotels I have list.
If cannot found a hotel room in dowtown Chattanooga then I recommend the Hamilton Place Mall area which has good hotels. The ones I would recommned is theCourtyard By Marriot, Days INN, Hampton Inn, County Inn and Suites and Fairfield Inn by Marriot.
Now heading ino Geogia is a different ballgame. When into Dalton is good place to stop for the small outlet strip. But I would not there I got to Calhon where they plenty of outlet malls and hotels. Good traveling until get started getting in Rome Georgia then it's messy. Watch for road concruction it all over the place and can have delays.
Also I would keep my eye for the Georgia State Partol they love to give people tickets.
Get ready for the Daytona 500 heading toward Maritta. This where the crazy driving people is at. They believe in driving fast go with the flow or you will get run over. Don't worry about the Geogia State Partrol here they will catch. It's better to get a ticket then to be dead. Also avoid rush hours like the bad news. Do be fool in thinking that taking the Atlanta bypass that it will be no traffic wrong. It's lots of traffic. Going directly into Atlanta is worst.
But once get past this it's smooth sailing all the way to florida border and start back watching for the Georga State Patrol
The Attactions in Atlanta is Six Flags Over Georgia and White Water and the malls.
I am the owner of the combo tickets to both parks and love going to Atlanta malls for shopping trips.
I hopes that helps