I focus on the breath, and most of the time my mind wanders crazily - but I keep taking it back to the breath.
On some occassiosn though, I find myself thinking about certain Buddhist teachings like being present, or more specifically, realising there really is no future or past. Now and then things dawn on me to coin a phrase.
Then I take it back to the breath when I realise my mind has wandered.
My point? Not sure. That if your mind wanders it can do a lot worse than wander into Buddhist teachings?