If you have nerves of steel or a complete disregard of the concept that glass breaks easily, try the glass floor on level one...
The only things separating you from 100 metres of rapid descent are
a) a layer of (hopefully toughened) glass
b) sweat - lots and lots of sweat
Visitors are only allowed to walk on the glass floor when they've taken their shoes off.
Here's the glass during school half-term week, where hordes of little kids have deposited foot-shaped outlines of perspiration. Lovely...
Foreground : sweat
Background : the quick way down