You can never put too many miles on a new jeep but fear not, you will eventually get to the point where you feel that the shortest route is the best and not every dirt road has your pot of gold at the end. You may even stop making excuses to go for a drive.
Eh... who am I kidding? None of this is going to happen. Just enjoy it. As long as it isn't a lease with mileage restrictions, you're good. Wranglers also hold their resale better than most vehicles so I wouldn't worry about that either.