Seaweed bergs (usually obvious enough to avoid)
Stingrays (some catapults, some survivals)
Fish (usually see them too late, if I do see them)
I've dodged plenty of sea turtles. I would feel guilty running one of those over.
Always try to avoid jetskiers.
Someone else here hit a manatee.
Someone else got knocked off foil by a shark, took a bite that drew some marks, then winged home to sail another day
