Aloha Peter,
I don't get to check the BBS or email that often so Ill give you a quick blurb on whats going on on Oahu and specificly Kaneohe Bay.
I'm currently the fleet captain for the 20' cats at Kokokahi Sail Club which the Hawaii Hobie Cat Association Division 1 Fleet 6 is part of.
We have either races, cruises to the sandbar or sailing seminars (Hobie 101) on the first Saturday of every month. We have @75 beach cats (not all active) and get @10-15 out sailing on those days. our largest active fleet is the Hobie 20's (can't find any used 20's for sale). I myself have been to a Hobie 16 worlds in Mexico (3 teams from Hawaii that year), Hobie 18 NA in Jacksonville FL, Hobie Wave NA at Rick's place in Key Largo served on the race and protest committee at the Hobie 20 NA in Santa Barbara and have been an active beach cat sailor in Hawaii for the last 18 years. MAN am I getting old!

The Hobie fleet is still alive but doesn't hold regatta's because of the restrictions of the class orginization.
Aloha, Dan (dray) Williams