I spent some time in that area hunting javelina several years ago. As I recall, Gleeson isn't much. There is some interesting country to explore around there, but I don't recall anything that would terrify a greenhorn. I don't remember anything that a 2wd couldn't handle in good weather.
The mountains between Tombstone and Gleeson and north are interesting. Cochise' Stronghold is in the area. There are a couple of other interesting historical sites around there, too.