Waterproof Phone Case: Because it would suck to miss out on some ocean Pokemon Go action.
Shark Repellent Wristband: You survived a ship going down. It would totally not be cool to get eaten by a shark while adrift.
Knife: Generally blades under four inches are allowed on board, but check before you go. The smart play would be to get a Swiss Army Knife for all the extra gadgets.
Food Supply: Bring enough food packets to keep you going for a few days. American Red Cross sells some great ones that are small, but loaded with what your body needs. Not sure if they have any beer packets, though...
Pretty soon hipsters are going to be bringing pro lighting and camera cranes into restaurants.
Thanks to the environmentalists, we are all going to be driving these things soon.
If this cop isn't arrested for indecent exposure, I am going to be very upset.