When we went to the falls we went with a tour through the ship. Yes, we had bathing suit on under clothes. Once we arrived at the falls, we left all our stuff in the bus, which they locked up and did the falls in our suits. Be sure to have some water shoes and bring a camera. The guide will hold your camera for you and take your pic if you want. As for the shoes, if you have some old tennis shoes, they will do just fine too. If you can, slip a few bucks in your pocket, those guide will be expecting a small tip at the end :-) Enjoy the falls, they were fun and watch out the rocks can be slippery and the water is cold!