We spent a full week in Tonga. We stayed on Fafa Island, a tiny little island (you could walk the entire circumference in 30 minutes) that was a half-hour boat ride from the main island. Tonga was beautiful. Our "fale" (the Tongan word for cottage) was right on the beach. We could look out from our bed and see the sunrise to one side and, later, the sunset on the other side.
Here's the fale:
The view from the porch wasn't bad
Some other views from the island:
We also poked around the main island on a couple of days.
One of the more impressive sights was the blowholes on the northern coast.