Welcome! Are you coming for a visit or something more permanent?
Fresh Bikes is a good place to rent bikes, and they’re near Big Creek which has fun trails. You could also head up to the mountains in North Georgia and ride Jake / Bull mountain. What type of ride are you looking to do?
Not sure how you will transport your bike to trails when you are here. Good luck with that adventure for sure. And FYI, Ropes Mill is under water last I heard. Which is unfortunate as I love that trail tremendously.
Another Top 3 trail in Georgia is Chicopee Woods just NE outside of Atlanta. Great trails to ride for hours.