I have five days to get from Chicago to San Francisco next month, and I'm hoping that on one or two of the days, I can spare a couple of hours for some sight-seeing. Specifically, it looks like I'll have time to spare in Nebraska, Wyoming and Utah. However, all the parks I've considered (Arches, etc.) seem to be at least a 180-mile detour from I-80. Are there any sights close to the highway? I only have a few hours to spare on any day. (Also, I have a dog, but I would assume that's probably not a big deal if I'm pretty much just running in and out of these parks.)