Many years ago I did a little trad climbing on the limestone of Tonga's 'Eua as part of a trip around the world. I was limited to a house sized boulder on the south end of the beach at Lokupo but could see potential, on the huge cliffs that run the length of the Eastern coast, for some amazing sport routes. There were rumours that an adventure guiding company did operate climbing trips around those times as well but I am not sure that was true. Maybe some abseiling? 'Eua has been mentioned a few times since on here but development never went ahead until now. An intrepid bunch from NZ have been granted permission by the King (owner of the land) to develop climbing on 'Eua and they are keenly sharing there efforts with all. I will be going back and can vouch for it being a brilliant place to travel with much to do and now even stella multipitch limestone sea cliffs! Check out their website: http://www.tonganrock.org and Facebook pages: http://www.facebook.com/groups/986159234811952