My plans wouldn't drastically change. I would still work on the projects for which my participation yields the the greatest increase of the probability of a sufficiently positive outcome of a technological Singularity. But having infinite willpower would have the surprising disadvantage that I couldn't experiment with increasing my willpower anymore. So, my advice when it comes to willpower increasing would be pretty bad (unless I know how to generate infinite willpower of course).

Basically, I would just get more important stuff done. I would forgo all purely recreational activities, as they aren't as important as improving the world and securing its existence and quality.