Foam ear plugs cut in half to protect ear drums.
1m long downhaul line in board shorts pocket (excuse to wear them over shortie wetsuit).
Used to have a whistle, helmet and life jacket when I sailed alone in cold water hours away from civilization.
Various more tips and tricks including some technique:
windsurfing.lepicture.com/tips-and-tricks/Also, in general, concentrate your new move technique early on then ease out and when tired (failing transitions) give up, there'll be more wind tomorrow...