The guys at 4th Street Liquor were very helpful finding beer when I simply asked "What shouldn't I miss?" Ended up taking a variety pack from Big Rock brewery that I would have missed. According to the staff, Big Rock is credited with turning beer around in British Columbia.
Also a nice range of beers not available in Minnesota from St. Peter's (England) to Innis & Gunn (Scotland) to Fruli (Belgium) to Tree Brewing (British Columbia). While the selection doesn't match the 1000 beers of my local liquor store, it is very good compared to what I've found elsewhere in Canada.
All of the beers I sampled were fresh and tasted good going down. Most of the beer was in a walk in cooler, so it is well taken care of. Also, 4th Street Liquor is only a few blocks drive from the downtown Brewster's Brewpub in Calgary. Nice combination stop on the way to Banff that affords an excellent chance to pick up some quality quaffs for the cooler while visiting the parks.