There are lots of stalls selling rubber shoes outside the gorge and inside, too. However, you will be completely fine wearing sensible submersible shoes that have a decent tread on them. Not flip flops! The rocks are slippery and sizable. The flowing water is forceful. We recommend shoes with a good tread so that you can easily walk along the canyon after you have crossed the water. If you intend to take photos or videos inside the gorge, make sure your equipment is in a waterproof bag in case you slip when going through the water. Also, wear clothes that you don't mind getting wet.