Colorado touring, prelim. planning.

We are at the very beginning of planning a trip to Colorado. We will
be there early Oct. for about 1 week. We like outdoors and definitely
would want to see Rockie Mountain NP. Other than that we don't know
much. Here are some questions.

1. We are driving from northern Calif. Should be take I-80 or Hwy 50
and catch I-70? We don't have any specific desire to see Denver, but
will if the route go thro the city.

2. Aside from Rockie Mountain NP, what other outdoorsy places would
you recommend?

3. Any other great sights to see? Esp. non touristy places?

4. We may also want to get in some cultural things, such as plays or
musical events.

TIA.