Hey guys, know that mission hidden around the area of the Ginormous Pineapple(I guess is the name of the area), to the Southwest of the Southern Rivers? Well, after completting the mission of rescuing the Police van from the top of the cliff, It's impossible to go up there again, because not only the rocks in the way respawn, but the bunyip of lifting the rocks doesn't respawn either.

And If I remember well, If you complete the mission of rescuing the cop car, you also is sent to the entrance of the mountain, and can't climb it up again.