A 4" lift will require allot of other things needed to be done to the Jeep to make it right. (use search function) to read up on that. To answer your question about "light" off roading, a set of 31's / a recovery kit / and head on out.
If after a few trips out , you determine you need more / better suspension you can go 2" or 2.5"........without all the mods required with a 4" lift.
Depending on your area in which you live, and what you plan to with the Jeep will determine the set up.
Anyway, there are dozens of guys / gals on this site with much more experience than I who will chime in, in the mean time....... have a great time with your ride, and be safe.