Didn,t do any windsurfing up there but a lot of sailing. Most wind is about 15 kts,so big boards and sails.Sailed Cats and big keel boats up there, a few crocs in the main harbor but didn,t seem to worry anyone.Stingers are the main health problem up there so avoid sailing in the wet season. Darwin Yacht Club is a great place to relax,have a beer and watch the sun set.The nearest non croc place would be Indo or Perth,your a long way from any where