Palm Island Resort, an off-the-beaten-path, private-island resort, is blissfully quiet thanks to its adults-only status. Five white-sand beaches spread out on 135 acres mean a secluded spot on the sand is always available, so honeymooners, this could be a top contender. Days here are spent sipping on rum punches (they are bottomless, after all) or exploring the lush interior hiking or biking on the various trails. Then it's back to your island loft (on stilts!) to gaze at the ocean-view from the comfort of your private deck.