Location: I would not have changed a thing! Dickinson Park on the northeast corner of Ocean Lake in the middle of Wyoming hit the sweet spot for a nice number of people, facilities, clear sky, etc. The DNR(?) officers on site where helpful and friendly. I stayed with friends in Cody, Wy and drove down in the morning and arrived about 2 hours before 1st contact. Had a nice relaxed setup. There was a bit of a traffic jam heading back to Cody but it only added an hour or two.
Preparation: With some craziness at work, My retired parents moving into my home and then into their home after a cross country move in July and August, I simply did not have time to prepare as well as I would have liked. I would have spent more time gathering and testing equipment, researching exposures, mounts, and automating the whole thing, etc. Instead I did the best I could with the gear and time I had to prepare and then convinced myself to be content with the results. In that respect I had total success! One minor mistake on site was I failed to recenter the ETX just before totality and (maybe) focus could have been slightly better.
Equipment: I would have used a better mount and mounted all optics to it. The old ETX90RA I used was just a bit flimsy and had some mirror-slap issues with my old DSLR. I would have purchased 1 or 2 mirror-less cameras (maybe Sony a6000's?). I wish I could have had time to automate the whole photo taking portion, I hand held my DSLR with 300mm f/4 lens, which worked well, but I would have preferred to just watch. The GoPro I brought did a really good job of capturing the color and ambiance but I also wish I had borrowed and extra GoPro to video out over the landscape. The Solar Eclipse Timer app was dead on for timing. Also wish I had brought my binoculars.
Still, I have very little in the way of eclipse regrets...