Nepean River Kayak. Kayaking on the Nepean river beat all my expectations. Paddling through the gorges was an amazing experience. I started my kayak adventure down the Nepean River early. Just 15 minutes into the trip and you feel like your in wilderness. I had the place to myself. I kayaked for 2 hours, 15 km’s until I reached the Nepean River and Warragamba River junction.