HERE is a google map I recently made for a friend of mine who made a similar request. He's a transportation planner focusing on bike stuff, so the map has a lot of that, but it's good in general too.
I'm not sure one day is enough time to see both Boulder and Fort Collins, but more power to you if you can. Boulder is the better / more interesting of the two, so if you can only do one, make it that one. The best part of Boulder after downtown / Pearl Street is University Hill and the University of Colorado.