There is nothing to be paid at all. If you like, you may register at either of the hotels (Didima or C.P. Hotel), but thats it.
The campsite is not near to the C.P. Hotel, but near to Didima and the park entrance gate. Cost is 90ZAR/p/n (11/2014).
I am hiking the long weekend from Saterday morning from 30/4 to 2/5/2016 up Mikes pass with my kids in group of about 6.
Any hikers that want to join are welcome.