In reply to John Blab:
Make sure you take a copy of the latest edition of Di Taylor and Tony Howard's guide to trekking, scrambling etc in Jordan. The first edition was excellent but this new one is even better. It should be in the shops now and it'll open up all sorts of new dimensions of Jordan for you beyond Wadi Rum. Petra, for example, is well worth several days, at least, and for some adventure, try Wadi Siyyagh.
One other tip -- take the trouble to learn a few phrases of Arabic (eg the first few phrases of greeting ritual). It's not difficult and will enhance your encounters with locals.
Have a good trip.