Dry bag to hold everything you want to stay dry and connected to your board if you tip it or run into big waves. 10 liter is my normal trip size, 20 for a long day with extra water and lunch, a towel, rain poncho (good for wind as we) sun scree, bug repellant. Water shoes that won't come off. I have three pairs of these and have worn them boogie boarding in the surf at coco Beach for a day without getting sand inside of them, or having the waves tear them off my feet. I've gone swimming with them on many times, including jumping from a rope swing, and they didn’t come off. They're comfortable for standing on the board, and protect my feet for walking over rocks or whatever. I bought them the first time because a page I followed got a discount code, but my recent purchases were just because they work so well. In addition to a whistle, a small plastic mirror for signaling people at a distance during daylight hours. If you're ever lost at night, a small light shows up like a magnesium flare to anyone using night vision goggles, so something like the light on your phone. A waterproof case for your phone that has a lanyard and floats.
