Oh also, sometimes there are opportunities to serve on the board. You may not be interested right now, but that also is a way to get a different kind of experience. E.g. if you didn't have budget management but then served as treasurer for a couple of years that would look good on your CV.
*Some honor societies are run by members who have long-since graduated, as opposed to ones that are run only by current students, so that might be a factor in your decision.
*Also, usually there are local chapters and national. So if you decided to get involved locally, that could just be it, but people who are on national committees sometimes have a little more prestige.