What items should I keep on my pontoon boat?

[RockLobster1]

I just bought my first boat - a 24 foot pontoon. I am putting together a list of items I should store on board, and I would like to know your ideas. So far I have - Life Jackets and Flotation Devices, Back up Battery pack, Gas can, Oil, Tools, 1st Aid Kit, 2 gallons of water, some rags, playing cards, Antibacterial soap, a blanket and some spare towels, bug spray, a flashlight, biodegradable tp (we have a potty) and some ponchos. Did I miss anything?