Not doing a PhD.
I had a few job offers as well as the PhD offer, the PhD was very interesting, so I took that. But had it not have been in my interests, I would have chosen the jobs, no doubt about that. The idea of having a PhD is not appealing if you have to spend three years doing something that doesn't interest you, as that reflects upon the field you will enter after PhD, and you could still not be interested. I know some people change fields after PhD, but that does defeat the whole point of even doing one if you plan on changing fields after PhD when you haven't even started a PhD yet!