Blackrock seems hardly used, other than by people staging for their trip the next day. Never seen more than a couple of people there. about 30 min past KM.
The others that you mention are heavily used by the ATV crowd, and seem to be noisy and dusty, and I avoid them.
Kennedy itself is not used by the ATV group, and is generally nice. The Wildrose Trail is used by almost nobody.
There will be heavy usage of the area, in general, that weekend.
