if you're choosing to do it on rocks i would say that's fine. Acc to lostallhope, jumping from 150 ft onto land is associated with a 95% mortality rate. What it doesn't take into account is the length of time it takes for that 95% to die.
If you get worried about this, maybe bring some painkillers or hard booze to take before the fall, and try to fall in a place hard for potential rescuers to get to fast.