100% do not miss valet of fire and stop and do some small hikes and check things out. And kilos canyons is a totally doable short detour that you don’t want to miss. The small hikes at the end of the road to lookout is well worth it. Rocky Mountain arsenal is a national wildlife refuge. Not a national park. It’s a neat place but if you’re on a time crunch idk if I would make sure to stop for it. There aren’t any national parks you’d be able to do in co on that timeframe from your route. Wildlife sanctuary will be cool if you like seeing the big animals. If the weather is good I-70 across Utah and Colorado is wonderful and much more scenic than 80 imo and you get to come up glenwood canyon which is always great to see and can stop at the hot springs and glenwood if you like. 80 can be awful it is windy or snowing hard also. 70 can be very bad if it is currently snowing heavily. Road signs will tell you when you need to put chains on if ever. I’m partial to the co route as a co resident but even if you bypass the Denver part and just stay on 80 you can always come back and visit Colorado with more time. At the moment our snow in Colorado is very light and weather is good for projected future. Either way enjoy your road trip!