Nick,
I have never personally seen any (and I sorta hate to say this), but the rumor mill has it that during the summer there have been threshers caught out in the open area towards the Queen Mary. This may just be a forth hand rumor or a mis-direction, I really can't say for sure one way or the other
LJ is probably the most popular spot for threshers, at least that I know of. Good Luck,
Perry