The PPUR is one of the few such caves which the general public can easily experience and. It is navigable up to 4.3 km. and is reputed no deposit bonus casino to be the longest navigable underground river in the World. Park operated paddle boats take visitors for 1 hour tour of the cave to appreciate the different rock formations as well as the thousand of bats and swiftlets that inhabit the cave. Tours are scheduled daily except during extreme weather conditions.