Welcome aboard the RoadTrip America Forums!

First off, you seem to have plenty of time for both transits, and you have shrewdly allotted more days to the longer return trip. Seven days is adequate for the outbound leg, keeping in mind that you could spend that long in Yellowstone alone. I made some suggestions earlier today for someone making basically the same trip in reverse, so have a look at those first and see if they're up your alley or if you'd like something else. As for the inbound leg, Remember that besides following the old Lincoln Highway, US-30 also travels in the ruts of the Oregon Trail. Unfortunately, the main display exhibit at Dinosaur National Monument is closed for repairs, but the drive south from Green River, WY through Flaming Gorge National Recreation Area on WY-530 was intriguing to me as a geologist, but do make time to do what I didn't - stop at the district office just south of Green Springs and get some info on what you'll be seeing

AZBuck