I recall being in Hawaii at the Volcano NP and a bus load of Asians pulled up. They all got off and took photos of everything, the bus, t he curb, everything, and they weren't to the actual tourist site yet (the tubes). I don't mean to be critical of them, but it made me think about taking so many photos versus just taking it all in.
I used to be better at this, but now I find if I let my mind go idle, I start rethinking too many things.