I've been a few times - work related , generally.

It's certainly nice for a holiday , during the winter. Plenty to see and do. It is all a bit artificial though.

In addition to what others have mentioned , one thing I would especially do is go for a "brunch" or meal in the Burj Al Arab. It is (obviously) pretty expensive but a fantastic experience.

The fountains at the Burj Khalifa are brilliant as well. If you are into sport , there's usually something going on - either at Dubai or Abu Dhabi - tennis , F1 , golf , cricket - you name it.

And go to Boracay night club for the Philippines experience....