If you are prone to the problem, you may want to buy an over the counter brand of Dramamine or Bonine and start taking it the morning of your cruise before you leave home. Check with your physician before taking any medication. There is always a doctor on board ship. Callers must have your name and ship as well as cabin number, if possible. Also, if possible, the approximate location of the ship.
Most ships have a passenger talent night.
Why not share your gift with your fellow passengers. Gratuities Tipping is a personal matter. Only you can judge the quality of service provided to you on your vacation. Also, the same is recommended for your cabin steward. Envelopes will be provided to you the last night of the cruise.