Watercraft - boat, PWC, surfboard whatever - that are contrasting colors to the ocean are much easier to see.  I was aboard a Coast Guard Cutter a number of years ago; we were conducting a search pattern for a missing motorized kayak and were practically on top of it before we could see it.  It was dark blue.  I can't over-emphasize the need to file a float plan; leave it with a responsible friend or relative so if something happens it'll be a lot easier for responders to search for and find you.  I'm in the Coast Guard Auxiliary; local flotillas can provide much more information.