Lunch troubles in Wadi Rum
Traveling in Jordan it's easy, but lunchtime may depend on the journey, so be prepared to start eating from one to six in the afternoon, as we did in our visit to Wadi Rum.
Furthermore, road restaurants are scarce and not easy to find in most places, and being out, one precaution is absolute: WATER, but if you are in an organized tour, the guide will be aware of it and will help you.
Long travel to the castles of the desert
The full day trip "Castles of the desert" it's an easy trip (if you travel with conditioned air, as you surely do) but not particularly interesting.
You may count on long hours crossing an ugly desert, to see some buildings that are only a little bit more than inexpressive ruins. The exception is Qasr Amrah, a really beautiful building from the 8th century that was not exactly a castle, but a public bath.
The paintings in the walls and roofs are magnificent, and well preserved.
Being only 40 km from Amman, you may consider an exclusive visit, saving you time and kilometres.