Dublin City Council have included, in their Management Plan for North Bull Island, an agreed Code of Conduct for wind-powered activities on Dollymount - we would ask that everyone please respects this as it helped to secure use of the beach for kite surfing.
Below is an important extract of this:

 DOLLYMOUNT BEACH, FEBRUARY 2008, CODE OF CONDUCT (IKSA) 

• Setup, launch, and land your kite in the designated area. Use launch/land/setup/packdown area only to inflate and deflate kites. No launching and landing outside this area is permitted. No land-boarding (land-yachting) permitted at any time in this area. 
• Wrap up lines and sand down kite when not in use. 
• Promptly enter and exit the water from and to the launch zone. 
• Avoid unnecessary flying of large kites, other than trainer kites, on the beach.
• Land-kiting allowed, only, on the most northern section of the beach.
• Use a Kite leash at all times. 
• Stay 200 metres away from all swimmers and stay clear of all areas in front and to the sides of the lifeguard huts in the summer. 
• Give right of way to other beach users at all times. 
• Assist other kiters to safely land and launch kites.
  

For more information, please refer to section 7.4.7 Wind-powered activities in The Management Plan for North Bull Island.

This short video explains the environment of Dollymount beach, when it is ok to kitesurf, what are the best conditions, etc... Thanks to JJ Daly and Ray Twomey for a great job!

Here's a great fly-over of Bull Island