Not sure if wife would be too far along, but you can go try the zip line tour near Idaho Springs. I'm sure it would be at least a little fun.
Estes Park/Rocky Mountain National Park. Travel Trail Ridge Road down into Grand Lake.Can return through Winter Park/I 70/Golden. If so, stop at the Sweet Shop in Empire for some ice cream. Since you are over there, you might drive to the top of Mt. Evans.
Visit all of the sitting Colorado politicians that voted for the gun laws and thank them for not pursuing politics in your home state.
Maybe fish the Big Thompson (unless the fishing has been destroyed along with everything else by the floods).
A little out of the box, but one thing I've contemplated doing with my wife is going around the city and taking photographs with all of the art. I find it atrocious, but it provides a cool backdrop. Would be a cool thing potentially in the future to take your soon-to-be son(s)/daughter(s) and have the pictures taken again with you all in them. If this is something you might be interested in trying, send me a PM and I'll try to pull together some locations of some of the crazier/bigger "art" pieces.