This was an amazing experience for us and our 2 teenaged kids. Stunning scenery, challenging rocks, ladders, clambering through unspoilt forest, exploring breath- taking caves full of roosting bats and swallows, and floating down the river on our backs, singing at the tops of our voices. We leapt into beautiful deep pools from high rocks and had a picnic on the way around. You need to take your own snacks and water. It takes 6-7 hours and you feel quite tired but very happy at the end of it. The villagers make you hot coffee and fruit on your return. You can also buy sarongs and little woven bags at the village, all of which helps with local kids' school fees. Charlie, our local guide, was terrific - so knowledgable, helpful and seemed genuinely happy to be out and about with us. Wear good climbing shoes or runners with a good grip - they get pretty muddy and wet but they're very easy to revive after the tour. I wore reef shoes and it was a bit uncomfortable and slippery up and down the forest ladders and rocks. My fault entirely and I'll know better next time. You may find this activity too challenging if you've got bad knees, ankles or hips, so a certain level of fitness and physical ability is vital. As long as you're determined and robust, you'll have a ball. We're going back to Santo next year and will 100% do this again. The tour also supports a local village school and several villages, so it's a very important income for a great cause. Costs around 7500vtu per person - well worth the adventure and the feeling of accomplishment.