Just 30 minutes away, you'll find the Mapu'a'a Vaea Blowholes. Nicknamed "The Chief's Whistles," they're a spectacular sight to behold — layers of coral rock create pockets of pressure, shooting ocean water 30 meters into the air.
The royal buildings are not open to the public, but you can peer in from the gates — and maybe catch a glimpse of Tonga's monarchs themselves. The Royal Palace is a colonial-style wooden building built in 1867. Don't forget to take a look at the Royal Tombs before you leave.