Heh, Tommud is right.
The Jet is the Jeep entry to the "blingmobile" contest. While it does have 4 wheel drive, it isn't really intended for offroad use. If you wanted a more serious offroad vehicle, you should have gotten a Sport or a Limited.
Although even then, our Libbies aren't heavy-duty off-roaders without some significant upgrades and investment. They CAN be serious off-roaders, even rock crawlers. But again, it's all about how much money you want to spend on it. If you want to make a Jet an off-roader, expect to spend some significant cash.
If you are just looking for funky looking wheels, well then you will still spend some cash, (expensive AT/MT tires, larger lift kit) but maybe a bit less.