My understanding of a boundary is to give you a proper framework within which to work. what you will accept....and what you will not. What will you do if you find yourself in unacceptable situations? Boundaries should tell you how to act in a given situation.
For example, with the social activities you mentioned - if you know he will get drunk, then you would never consider going out with him socially. Your boundary would be that you would not put yourself in that situation.