How steep?
If you actually want to run, then going up Sulphur Mountain in Banff is a good one, and you can take the gondola down for free. (Double-check that, but the gondola is usually free for descents after Canadian Thanksgiving, which is this weekend.)
For a rolling run, check out “The Bench” on the north side of the valley which stretches from the Alpine Club at the east end of town all the way to Harvie Heights, the next town toward Banff. There are all kinds of trails on that side of the valley. Trailforks probably has the main ones. (On the opposite side of the valley is the Highline trail.)
For something steeper, Grotto, Lady Mac, EEOR, and Ha Ling are the usual suspects. In order of steepness:
* Grotto (30-40% in some sections)
* EEOR
* Lady Mac (~20+%)
* Ha Ling (new trail, probably similar to Sulphur Mountain I suspect, but I haven’t done it since it was finished.)
Reverse the order for the Busy With Tourists factor.
Damn, this is making me homesick… (Except for the tourists part)