I want to remind you that it will be very crowdy with the Eid in Aqaba. But if you decide to go, I wish you very nice and cheerful stay.
And I told you about Salt 
If you want or have the time, try to see Umm Joze as well,near Salt. It is one of the most beautiful places.
Anyway, for me (ok. Petra is and shall always be at nr 1).