We were just there and had beautiful weather. Most of the time you'll be in sheltered water. I think the seas for most of the week were 0.3 - 1.5 feet which is vary calm. When we weren't in protected waters they were rated 1.5 - 4.0 feet, which is considered very smoothe but made some people a little sea sick. I know it could get much worse if the weather doesn't cooperate. Try a patch or dramamine or ginger. Also, sucking on a peppermint helps quiet the queasies. My husband had some side effects from bromine, so I'm not recommending it, but it did keep both of us from getting sea sick.