The Conservatory- Assiniboine Park

Cost:
50 minutes: $102.00 + $5.10 GST = $107.10
75 minutes: $152.50 + $7.60 GST = $159.60
100 minutes: $203.00 + $10.15 GST = $213.15
Parking: Free

If you like flowers- this may be the place for you. This huge Atrium is separated into two sections (a jungle type setting- and a English Garden type setting)
I find the jungle side much too dark for large groupings and a pretty tight squeeze as well. The side that is more open (typically where small wedding ceremonies take place) is a bit better for space and typically boasts a bit more color. I do always warn my own clients that because this is an atrium- if it is dark or dreary outdoors- it will probably be dark and dreary indoors as well. This building has no real ceilings so from a photographers perspective bouncing a flash isn't really an option.
In my opinion the biggest downside of this location is that despite your paid booking, it is still open on a free basis to the public who make their way around you. Also, depending on the time of year, the flower section is set to a theme (totem poles, poinsettias, etc.) so it might be a good idea to see what the theme is during the time you plan to be there.