Bring at least one pair of rubber bottomed shoes for prowling shallow reefs and treks ashore to the sugar mill ruins and the like. Oils are slippery, staining and often too intensifying for the strong sun rays in the islands. Don't forget the light long p.j. Some resort shops will have film, but they are often limited selections. Rather than miss those priceless shots, have plenty aboard rather than make the ship come to a stop.
Checks are unacceptable.
If your face is exceptionally narrow or wide, you might shop for the right fit before coming to the islands. Fins should also be brought if your feet are exceptionally large or tiny. These items are available here in the islands, but it is often a burden to stop and shop while mixing the excitement along the way. Scuba diving gear is not normally provided. Contact the captain well ahead of time if you plan on bringing your own scuba diving gear.