You used to be able to drive it, in fact they fixed for the anniversary but it was washed out almost immediately. I rode my bike in the year before thinking the Northern Loop, Wonderland trail would be less busy with the road closed. It has been almost that long since Ihave been in that part of the park.
Hiking to Mowich would be harder, uphill. I also day hiked from Mowich down thru Spray Park and back up the wonderland trail. Spray Park is very nice, I forget the other route, some nice dayhikes at Mowich, Tolmie Peak , off trail scrambles.
Carbon is a bit easier to drive to, not sure about parking at either given the population increase etc.