There have been some break-in incidents at the parking, but not for a while now.
You can walk in from fern, but its better to walk from the usual Mhlabs parking.
You can walk around to the top on the western side of the kloof to avoid the wading, but its hot, steep and crap. Much better to take slops and shorts and wade up the kloof. Its quicker and funner and its easy to keep your backpack dry.
Are you an MCSA member? If not you need to organise permits.
PM me if you need more access details/directions/route recommendations