The pool at the bottom of Killen Falls looks like a tropical oasis, fringed by ferns in a rainforest gully just 15 minutes’ drive from Ballina. Access involves a bit of fence-jumping and negotiating a slightly uneven embankment, but once you’re down by the water, you won’t believe you’re just a few minutes’ walk from your car. The best thing about this particular swimming hole is that you can access the cave directly behind the falls.