my first solo road trip- Denver to Boise!

[birdybird]

Ok, so this is actually a continuation of my first thread, where I posted about being "scared as hell" about my first thoughts about a solo road trip from NC to Idaho. After lots of feedback and further thinking, I decided to go for it, but tweak the trip a bit so that it wasn't so much alone driving for my first time, and also included my husband- who couldn't do 8 days with me but can do a long weekend.
So, I"m now going to fly to Denver ( I got a one way ticket, of course hubbie will have a roundtrip) Tour the sights in and around Denver for 2 days- then hubbie flys home on sunday and I will take 3 or so days to drive to Boise. I am planning on going north to Cheyenne, then meandering west, back down to Salt Lake area, then up to Boise. I can easily do it in 3 days ( it's about 830 miles total)
Any suggestions for sights to see? Routes I haven't considered? Things to do in and around Denver?
Thanks so much! You guys are awesome!
Birdy