Too much marijuana is bad... but smoking a small bowl of potent marijuana after a workout later on at night isn't harmful whatsoever. Smoking pot morning, noon, night is detrimental, but taking a couple hits at the end of the day isn't going to harm anything.
Other than that, if you're gonna party get some GHB or Xanax, stay away from alcohol. And I mean if you're gonna party like once a month, not everyday.
The point being to keep the partying to a minimum. Get yourself a cycle whore be content bangin her for a while.