There is a brightly colored waterproof container made especially for eyeglasses you may find in your local SCUBA store. It is hard plastic outside and cushioned inside with a secure snap-down latch, and comes with a cord for carrying around your neck. For my next trip, I'm planning on leaving it with my towel and shoes and so forth at my waterpark "base camp," because I can see shapes and colors well enough without my glasses. However, if you need to, I think you'd be very comfortable waiting until the last minute and then slipping your glasses into the container, closing it securely, and tightening the cord (as added security) so you can hold on to it as you go WHOOSH! I hope this is good information for you. I've been on Summit Plummet and Humunga Kowabunga, but I did not take my glasses with me, although I think I could have.