Another high point is Swallows Cave where at the end of swimming with the whales or diving you can visit this cave. Where you can snorkel inside with thousands of bait fish and swallows flying around the roof the cave. At the right time of day the sun shines a beam of light through a hole in the roof of the cave and the beam goes all the way to the bottom of a 20 metre pool.
And the diving in the clear water is fantastic, experiencing visibility of 25 to 40 metres on the dive sites is the way to go.
The Vava’u Island group in the Kingdom of Tonga is a spectacular tropical island paradise in the Pacific Ocean. It has a year-round climate suitable for swimming, snorkeling, diving and sailing. Some islands are ringed by white sand beaches while others have tropical forests, sea-level caves, and dramatic limestone cliffs with breathtaking vistas.
Remote and truly unspoiled, the waters around Vava'u are crystal clear with visibility exceeding 100 feet. Most of the islands are uninhabited, a few have villages, a few have very small unique resorts with exceptional food. There is abundant sea life with over 100 species of colorful tropical fish, giant clams, manta rays, sea turtles, spinner dolphins, and July-October the Humpback whales!