At Blizzard Beach, DS, DD, DW and I have worn Timberland, Teva, Columbia and Nike water sandals every trip. Summit Plummet and Slusher Gusher were the only slides where we were required to remove them, along with our swim goggles. Other than that, we always wear them, and have never had any foot problems. Going down SP and SG clutching 3 pairs of sandals and swim goggles was not hard, actually kept my mind off of waiting for that initial over-the-falls drop! Hint: Whenever you pass one of those outdoor showers, take your sandals off and rinse them. Walking the paths at BB, you can pickup small debris in them which you won't notice until later, when they start to cause irritation. I love Nike RCG water sandal model, I have Plantar problems and the Nikes provide very good arch support. Water sandals will help save your feet for future trekking thru the other parks.
CBR: '93, '03, '04, '05. '07. '10