Book These 10 Summer Vacations ASAP, or Risk Big Price Jumps

From Nantucket to the Amalfi Coast, these top summer destinations are filling fast. Here's where to book now before availability drops and prices climb. If you haven't yet locked down a house rental or hotel stay as a summer treat to yourself -- and perhaps your BFFs and family -- what are you waiting for? Because the longer you wait, the fewer places there are to sleep at night, and the prices will only go up, not down. In addition to summer being peak season, some destinations around the world are hot and trending -- and necessitate booking well in advance. From relaxing beach vacays on Nantucket and the Big Island, or in the Hamptons, to dream trips in Osaka or the Amalfi Coast, not to mention the heightened popularity of national parks and theme parks once the kids are out of school, don't sleep on these.