This is a giant 6 foot inflatable ball. With this ball you walk across water as fast as you can stride since you will find hundreds of exterior inset cups that help grip the lake or ocean surface as you clamber up the spheres interior.
The heavy-gauge PVC ball has two entrance/exit openings, and supports a single occupant up to 170 lbs.

Looks like a lot of fun, don't you think?

order at Hammacher