Best Place to Blow Serious Cash

If there's one thing that can ruin an island vacation, it's other people. Whiny kids, boorish high rollers and beer-fueled revelers can quickly strip any paradise of its sheen. The simplest way to get it back? Buy them out. And there's no better place to do that than Dhoni Mighili. This one-hectare patch of white sand and lush foliage in the Ari Atoll, a 30-minute seaplane flight west of the Maldives' capital, Male, is always restricted to just six couples at a time. But if you don't like the thought of sharing the place with any strangers—and if you can spare...