MJ went to Bahrain, which is still part of the UAE.
Dubai is a beautiful city and its filled with foreigners. I've yet to go, but I have close family & friends there...so hopefully I will visit them soon. Lots of cool things to do and places to see.
The reason why it is such a prospering city state is because a) the governing royal family/leaders recognize that oil cannot provide permanent income to hte country so they are building up tourism and international business markets b) the governing royal family (leaders) actually care about the city and its citizens and want to provide them with a good life.
If the leaders themselves are rich beyond anyone's imagination, they won't be so focused on getting richer but rather maintaining their wealth and power which means keeping their citizens happy & content and providing for an constuctive infrastructure that supports expansion.