Tonga - Ha'apai
Situated approximately halfway between Vava'u and Tongatapu, the Ha'apai Islands are everything you might imagine of a tropical island paradise.
Ha'apai is a top 10 travel region according to Lonely Planet's Best in Travel 2014 guide. Get there with Friendly Islands Kayak Company before word gets out!
Also be sure to check out the Vava'u Island Group for further trip opportunities