Taking a trip to the west coast

Not sure if this is the right spot for this topic.
Work is sending me out to Seattle this Saturday 8/14 for a week of teaching and then the wife and I will be taking the train back to MD. We will be getting on the train on the 21st and heading down to Sacramento. From there we will head over to Denver where we will spend a couple of nights and check out the city. If anyone has any advice on what to see it would be appreciated (I did get permission to go to a baseball game there). Next we will continue on tho Chicago and then up to Milwaukee where we have some friends we haven't seen for a while. On the 27th we will then reboard the train that will take us back to MD. We took the train to Seattle a couple of years ago that went through the northern states and it was great. Lots of old, lost cars and parts in peoples backyards that noone ever gets to see. If anyone is nearby on my trip just say the word and I will try to say hello in person.