How to have this honeymoon: Hawaii is expensive, and Kauai may be the most expensive island. Look for better deals on the Big Island—several of the Kohala Coast properties are every bit as stunning as the Poipu resorts. November is when you’ll get the best bargains. January is also sale season, but it rains heavily. If you’re on the East coast with limited time and/or funds, trust us: Puerto Rico and Costa Rica are equally beautiful, lush and exotic—with nearly the same amount of English speakers.