Well, if you're willing to drive up to Boulder, I'd say the Boulder Tea House would be an awesome location...but you'll have to make reservations in advance (of course), and it might be too far out of the way. Racines on 6th and Grant downtown (Cap Hill) has excellent food and a nice atmosphere too...
Lovely Confection has a space which you can use for a baby shower.Awesome cupcakes by the way.I have been to the Holiday Chalet for a wedding shower and we had a great time over there.
here is the link to the tea place:
The House of Windsor in Lakewood is wonderful!
It's where I'm having my shower