If you're concerned about them falling off, wear a lanyard. There is a camera mounted on the wing of the glider, so you won't need yours in the air, but a friend might want one to take pictures of you launching or landing. Tow Kitty Hawk Kites provides all of the required gear but don't forget to consider the fact that you will be getting wet. You can wear sandals on the boat, but you will probably want to kick them off for the flight. You can wear a bathing suit with or without a t-shirt and shorts over top.
Sunglasses are a good idea.
If you're concerned about them falling off, wear a lanyard. There is a camera mounted on the wing of the glider, so you won't need yours in the air, but a friend might want one to take pictures of you launching or landing. We provide the instruction, guides, life jackets, paddles, and kayaks. Wear a pair shoes you don't mind getting a little wet. Sandals are fine.