Humpback whales
Fly to Tongatapu, Tonga. From there it's a domestic flight to Vava'u.
June through September
Tonga
Dive Vava'u (divevavay.com), Dolphin Pacific Diving (dolphinpacificdiving.com)
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Diving opportunities in Vava'U Island, Tonga are available.
By Scott Tuason (Adapted from "passport to diving the world")
A place blessed with regular visits from humpback whales.
There are few places on earth blessed with regular visits from humpback whales, and even a fewer where laws actually allow us to get into the water with these behemoths. Vava'u isn't really a dive site since the boats go out looking for whales; thus, locations change every day. And it's not even really a dive, as interactions are done on snorkel. The magic moments when you snorkel with a humpback last anywhere from a few fleeting seconds to hours of bliss. It all depends what the whales are doing and how you behave.
(Ok enough with the stories, I'm itchin' for a dive)