What exaclty are you looking for in a yacht club?
I know that Sandy Bay Yacht Club in Rockport has no waiting list - it's perhaps a bit more laid-back than many of the other yacht clubs (and is also signifignantly less expensive than may), but is active with various classes of racing, social events, etc., and the people there are great. Worth a look, depending on what you're looking for.
www.sandybay.org