Moss-green walls of rock rise either side of the river, forming a narrow chute where the water curves right then left, drops into a small hole, and continues around a final bend before disappearing out of sight. I edge my way down the slippery, smooth channel and test the depth of the first hole. Caz is waiting at the top. I give him the thumbs up. It's time for his next water slide.
I scramble out of the way as Caz gives a little "woo-hoo" and splashes to the bottom of the ride above. The water is freezing cold and a rich emerald colour. We swim as quickly as possible across the large, deep pool that lies hidden around the final dip. Our small packs are like buoyancy vests and our wetsuits keep out the worst of the cold. We are both grinning from ear to ear and the day has only just begun.
