Yus... inventories of charter boats are usually pretty good.
what to take:
Hat's
Hand held GPS - one that you are used to. My Magellan goes everywhere with me.
Get a pilot of the area before hand, I am sure Rod Heikell will have one.
Books to read with the wine in the cockpit for the evening.
A 12volt charger for your mobile phone is often a good idea.
Teabags and teapot.
CDs or MPEG player.
Plastic shoes for swimming (may be cheaper to buy there)