Dress warmly! even if it is a sunny day it can get cold out on the water , we have plenty of storage , so don't worry about bringing too much.
Flip Flops and high heels don't really work on a boat. Besides being cold (even on warm days) they take away from having sure footing moving around the boat and the dock.
Bringing some bottled water and a light snack is always a great idea. Please check if any of your guests have peanut allergies. Many "snacks" can trigger a allergy response that will make for a unpleasant trip for all!
Sunscreen is always a great idea.
If you are prone to seasickness please see the gift-shop beforehand to get some medication.
We carry an extensive First-Aid kit and the skipper is trained in first aid.