What is rideabuck?

Answer 1

Ride-A-Buck is an arena game where you ride your horse or pony bareback with a dollar bill tucked under your leg.

The object of the game is to be the last rider with their dollar still in place.

The game starts out easy with walking, turning, and stopping, but gets progressively more difficult (backing, trotting, cantering, etc) until there is only one rider left with their dollar still under their leg.