Paracord and Straps: Paracord can be used for a gazillion things and you can wear it as necklaces or bracelets for easy packing. And bring some straps for your hat, sunglasses, etc.
Sunscreen and Sunglasses: The sun can be brutal out there on the water, so make sure to protect your skin and your eyes. Those things are kind of important.
When you don't think you're old enough to change careers but you hand THIS to your kid so they can 'help send my resume using the online.'