The town of Laporte, CO north of Ft. Collins has super tight wooded 9-hole pitch n putt course. Probably the most fun I have had playing a short course.
I just want to second this statement. Very short pitch and putt that you can go through in about 20 minutes - but it was surprisingly fun. Being behind a small junior high - I don't think there are ever people there, and it's just challenging enough to make you work and see how low you can shoot. You know - finish a round - think about the one or two bad shots that may have cost you a bird - go through and then do it again. Good stuff. In the summer - you can beat it for weather and atmosphere.