There are now so many things to do while on a cruise — from rock climbing and zip lining to wine tastings and relaxing by the pool — that it’s easy to fill your days and nights with exciting experiences. But there are certain things you should never be tempted to do while at sea. Some are way overpriced, others might induce buyer’s remorse, and one may even leave you stranded. Here are our five things to avoid doing on a cruise ship.