You most certainly CAN, and people DO swim in Bay Lake - check out Sammy Duvall Watersports at CR marina. Wipeout waterskiing or wake boarding and I can just about guaranty you will be swimming (and have fresh water up your nose).
You just can't swim at the beach!
Don't know how they cope with the amoeba danger (Primary amoebic meningoencephalitis (PAM) - just about every freshwater lake in Florida - see
http://www.abcactionnews.com/dpp/ne...-danger-lurks-in-some-florida-lakes-and-ponds) - testing of the water maybe? The article states "Basically the organism likes to stay in the surface mud layer in a spot where there isnt a lot of changeover in the water" so they may be counting on being away from the shallows along the shore - swimming puts you right in those shallows.
Haven't seen the liability release form you sign for Sammy Duvall but I bet you must acknowledge and accept the risk - anyone know?