You can boat and tube, but I don't think you can swim, no.
I don't see any ducks.
Look harder. There are ducks in both pictures.
There are also a bunch of American Coots in each picture. Those are not ducks, but Jason doesn't seem to appreciate the distinction just yet.
I can kind of make out might-be-ducks on the second picture, but not on the first. Probably my screen is not so great is way.
Can you swim in that lake?