One of the best parts about enjoying our great outdoors is that you can make your time as relaxed or as intense as you wish. You can hike a nice trail to see tall, awe-inspiring waterfalls. You can enjoy some calm, flat waters atop a kayak. Or you can combine the two, take the risk factor up tenfold and paddle your sit-in kayak down a 100-foot tall waterfall (after a lot of training and preparation, of course).