Yep.
For river cleanups, go to:
http://www.cleanrivers.caMany members on the discussion forum participate in these cleanups from time to time. The next major event is BC Rivers Day on September 30th, which involves a river cleanup and a BBQ plus entertainment afterward.
For lobbying, join an existing sportfishing association such as the Fraser Valley Salmon Society, BC Federation of Driftfishers, BC Federation of Flyfishers, BC Wildlife Federation, Sportfishing Defence Alliance, which have representations at important sportfishing related meetings.
For conservation, fishery enhancement and other stewardship work, join a local stewardship group. Seymour Salmonid Society, Chilliwack River Action Committee, Port Moody Ecological Society, KEEPS, Streamkeepers... etc...
For fishing trips, interact with members here, generally some will end up becoming friends and fish together at times. Once awhile there are casual group fishing trips set up in the last minute at times too.