Contact the companies when you arrive and they might change their mind.

You arrive either during the last week of Ramadan or just after it ends. The malls during Ramadan are open 10am-1pm and 8pm-1am. You can call for a Taxi or Limo (more expensive). During the Eid holiday after Ramadan most shops will be closed for the first couple of days. Your fiance should have time off too to show you around.
Have fun.