Yeah I have climbed in Tonga, on 'Eua, Lokupo Beach to be exact. I was staying at Taina's place back in 2003 with my missus. We carried full gear across the island to explore the cliffs that we'd seen on maps. When we got there we couldn't find anything small enough on the major cliffs for our limited ropes so we climbed on a large lump of limestone down at almost sea level at the back of the beach. Down there you could have been transported back a million years. What a place. If you have time, money and inclination there is undoubtedly masses of potential for sport climbing on 'Eua but you will see a lot of very sharp rock unsuitable for climbing too. It would be great to see some development of this place beyond our web musings over the years. I will try to dig out some images.