September 2020 Suggestions/Advice

I would suggest Yellowstone. It would be about three decently long days of driving each way, leaving about eight days (or maybe ten if you "cheat" and include weekends at both ends of your two weeks) to see the park--certainly not enough to see absolutely everything, which would take years, but enough to in my opinion do it some justice. It's such a geologically unique area that I think most everyone ought to go if they have half a chance.

Yellowstone could be rather chilly that time of year. It's also not the most dog-friendly place (as is true of many of the national parks); if possible, in general, I'd suggest leaving the dog behind for a trip such as this.