Amman should be your base when you visit Jordan as there are many worthwhile day trips within reach of Amman. Choose a day trip to Jerash, the Dead Sea, Madaba among others. Easy access by bus, tour or rental car. Not to mention Amman is actually a cool city to explore.
Jordan is amazing and no it is not just Petra. There is the amazing float on the Dead Sea; the dark nights and red sandy days in Wadi Rum Desert; the Camels, Bedouins, Nabataeans, Romans, Greeks and much more. Worth every travelers time is this safe Middle Eastern country called Jordan.
Driving around Oman to see as much of this amazing Middle East, Asian, country as I could. From Castles and Forts to Desert, Mountains, Wadis and Sea.