Are you living in Calgary?
If so, I would skip panorama. It is a long drive for a day trip and really not worth it, in my opinion.
Kicking Horse is great for alpine steeps. Definately try to hit Kicking Horse.
The best tree skiing within a days drive is Fernie, although it is a really long drive for one day.
Other options for day trips are:
Nakiska-good for cruisers-no real snow
Sunshine-best snow in the Banff/Kananaskis area-steeps are in the "freeride zones", otherwise intermediate mountain
Lake Louise-the biggest and most balanced resort. Intermediate and beginner terrain can be busy on Saturdays. Not much snow.
Castle-Long fall line runs. Nothing scary steep in bounds, but the pitch is maintained for 2000+ vertical feet. Usually more snow than banff, but can get blasted by high winds (including chinooks), often closing the top chair.
For a long weekend trip, you can't beat Red/Whitewater for trees and backcountry acccess. I haven't been to revelstoke yet, but this should be on your must hit list as well. The okanogan resorts are okay. They have nice snow, but I wouldn't go out of my way to hit them. A lot of Albertans love Whitefish, Montana, but again I can't comment.
Whistler isn't the easiest resort to travel to from calgary. In fact, the Bozeman resorts are probably easier and Jackson Hole and Salt Lake City are no worse. I-15 is an easy cruise, especially when compared to highway one in the winter.