I have seen people that go under the line floaty thing in the lake!Are we aloud to do that?

You are not supposed to. The area within the rope has been deemed a safe area to swim. But there are no lifeguards to enforce it. The park relies on the public to keep themselves safe

Yes the swimming area is deemed safe. There are no large motors allowed on the lake. Only trolling motors and kayak, row type boats. I have seen it done to swim out across the lake but I would be sure you can do it safely. There are no lifeguards.