So, I decided to create an amusement park, but haven'r quite figured out how to charge for the rides...

As an example, for a water slide ride, I could have a trade sign selling boats. A rider could either bring their own boat or buy one of mine. At the end of the ride, the boat would destroyed...leaving the rider safe (unhurt and not drowning)

Since pistons do not work, are there any other ideas for having a "you must pay to ride this ride"? I would like to have the park operable without me being online to run it, so I'm looking for automatic payment systems.

By the way, nothing will be ready in the next week or so...so don't start clamoring for "so and so" ride :)