Hey dude, I live in dubai and I'm learning the sport, getting up on the board but not quite yet...
anyway kiting here is reasonably good, except that the winds are usually light!
Today was a good day, we had 15 knots... but this isn't quite the windy season yet so most days range from 8-13 knots- bring your biggest kites! sizes 14-16-18 pretty much covers regular conditions, we sometimes get 20 knots but that is very rare.
another problem is that the official kite-beach has a limited launch and land zone, so on fridays and public holidays it gets very crowded.
On the other hand, you could always drive down to jebel ali (30 mins drive fron dubai) and enjoy huge stretches of empty beach, with huts and showers all the way down... this is the best place to surf on fridays... or any day really!
be sure to read the info at this site -----> http://www.dubaikiteclub.com