Crutch, be careful with your spondelolisthesis. Make sure to get it checked if you're having symptoms again. If you wait too long, it can slip farther and make it much harder to repair properly and re-gain full function.

Byrd,
You'll be pretty limited on lifting, however I wouldn't think that hunting would be out of the question, especially if you have a son who can drag your deer out of the woods! Otherwise, its a good reason to get a 4-wheeler.

4-6 month recovery post-fusion is until you're fully back. You should be able to walk around in the woods albeit gingerly in about 3 months. Whatever you do. don't puch it. Let your orthopedist and your back tell you what you can and can't do. In the immediate post-op period, trying to do too much too soon can cause major issues and delay healing and recovery a great deal.

Best wishes for your surgery and a speedy and successful recovery!

Also, be sure to do what your Physical Therapist tells you to do. They can be the key to your recovery and functional capacity.