Went to see a waterfall

I went with some friends to go see some waterfalls.
There were a lot more stairs involved in this trip than I thought there'd be. In fact, it was labeled as a 'fitness test'.

But the sign for those stairs said, "No climbing". It also said "no sharking" so we didn't take it too seriously, as there were no sharks in sight.
On the way there, we passed an interesting sight on a motorbike. Maybe they were going to the falls to swim?
We passed another rather frightening sign. How, I want to know, are those puny little sticks going to hold up that massive rock from falling on us?