I am not sure what is the "easiest" way. Perhaps someone else with more experience with
PSO can answer your question.
If you're not going to play cash/ring games, it may be difficult to fulfill the
PSO requirement. Most of the poker rooms do not count tournament play towards fulfilling the
PSO requirement. Bodog is the only one that specifically states that tournament play counts towards the
PSO promotion. All the other poker rooms require that you play raked hands and, as far as I know, tournament play does not have raked hands.