You will need to bring swimsuits, sunscreen, camera/video (underwater), shoes (even though you won't be wearing them on-board you will need them on shore) and a change of clothes is optional for those on a Day Charter!
For those on extended Charters you will need the above and additional sets of clothing and you will add toiletries and any other personal items you wish to have with you.
Please remember that you are going to be living on a boat for possible two to seven days and space can be at a minimum - bringing full suitcases is possible but it is not ideal!
If you are planning to sail for more than one day, don't forget to bring your I Pods or MP3 Players to utilise the stereo systems on-board the boats or just some reading material if you want.