1. Niue
Niue, a raised coral atoll in the middle of the Polynesian Triangle, is not huge - phone numbers have just four digits - but it has an amazing array of natural features. Much of the island rises 20-30m straight out of the ocean, so there aren't a lot of sandy beaches, but the coves, caves and the coral shelf that joins the cliffs to the sea provide opportunities to swim in the crystal clear water. You can fish, dive and socialise with the locals and an added bonus is that they use the New Zealand dollar.