Tofua Volcano, an active volcano located in the Ha'apai group of islands in Tonga, offers a unique and adventurous excursion. Despite a recorded population of only two, the island is a fascinating destination due to its steep-sided active volcano with a caldera and status as a bird sanctuary. The historical eruptions and rich ecological significance of Tofua make it an intriguing visit for those interested in natural history and birdwatching. Note that this attraction is free to those with their own yacht/boat for transport, which is a popular way to explore Tonga.