Take along an insulated mug with a lid. Fill it at the beverage station in the buffet area—your drinks will stay hot or cold and you won’t have to worry about spills. Most bartenders will fill it with ice and water or a soft drink. With a straw, your ice won’t melt instantly while lounging at the pool. Better still, mugs are great souvenirs—buy one that sports your ship’s name from the gift shop.