Leisure Park mud bog is a good place. It's on Avondale Mill Rd headed toward Macon. It's open every second Saturday of every month, $10 dollars to get in and they have mud holes and you can run your rig down the track at the end of the race. I also know a few dirt roads off hwy 96 headed towards interstate 16 right after the railroad tracks that lead out to two nice spots on the Ocmulgee river. I know many others just to many to type.