Jun 24, 2007
Just to add my 10 pence worth...
My first trip to Dubai in 2005 with my (now wife) was to the very same Jumeirah Rotana. No problems there, just make sure your 'wife' dresses conservatively if you fancy a walk outside at night, as the surrounding area of Satwa is mainly of staring male workers (nothing to worry about, but the staring may be a little disconcerting at first).
Passport control.
I have had many unamarried couple visitors through the past 2 years of living in Dubai - as previous posters have stated, holidaymakers are not targeted for being unmarried, and only if you committed another crime would the matter become an issue (and as non resident, non muslims, the matter would still be a very minor one).
My wife still retains her original passport with her maiden name. Every time we reenter Dubai, I have her come through E Gate with me, and not once have we been asked if we are married, nor any other personal questions, bearing in mind, we are both residents with resident visa stamps in our passport.
The key to Dubai is tolerance, which is why so many people of differing backgrounds and agendas can enjoy the place.
If you keep yourself to yourself, and not set out to insult or offend anyone, Dubai will generally be good to you (apart from your landlord who WILL get as much money out of you as possible).