Had to pick the last option, because all of these apply:
I think about Work
I think about Personal stuff
I think about World and/or Local issues
I think about how to improve my ride
I thinking about my next meal/beverage
I am in the moment, focused like a laser beam on the Here and Now…
I think that I want to go faster, and/or that I'm in a race that has to be won!
I haven't got time to think; I'm too busy dodging traffic/obstacles and trying to stay alive!
plus thinking about the dogs, stuff I see on ES and what I might want to post about that I found interesting, etc.
Songs I would like to finish composing, but probably never will. Same with other art forms.
Letting my mind wander about, pondering all the things I see around me.
Other stuff I can't think of off the top of my head as I type this.
I try not to think about more than four or five of those things all at the same time, though.