What would something funny to do when going to a water park?

I am going to a water park that is proudly owned by native americans. There is also a casino next to it. I am going with about 15 of my friends and want to bring something funny or that stands out. I thought about bringing a giant foam tomahawk, but i don't really want to carry it around. I also thought about wearing a t-shirt that says, "My Indian name is 'Rides the Slides." Regardless, I'm open to anything no matter how far-fetched as long as it isn't obscene enough to cause a disturbance. There will obviously be small children present.