I would suggest the use of Dramamine or something along those lines. Start taking it the day before and the day of the sail. You should be fine. If the waters are rough, try and center yourself in the center of the boat, towards the front. This will give you fresh air and the rocking will be less noticeable. Another thing that I have heard that works well is called Sea Bands. These are elastic bands that have a pad that fit into a pressure point on your wrists. Check out the following site if this appeals to you, http://www.sea-band.com/sea_band_usa.htm They can be purchased at Eckerd, Longs, Osco, Rite Aid, Savon, CVS, Walmart. If you do try the Sea Bands, please report back what you thought of them.