I would choose flying because I could see all the amazing things and not be stuck in traffic. Being invisible would be too tempting to do the wrong things.
Structural Steel, to show guys at work.
Have a coin collection.
Drive an exotic car.
Pinnacle Mountain or Big Dam Bridge.
A rock that I found when I worked at Arkansas Highway and Transportation Department. I took it to a geologist and he said it was a tree root from a couple of million years ago.