Navigation aid, traffic sign, speed limit sign etc. Majority of these buoys mean one thing, slow down and don’t make a wake. If you tie up to a buoy your blocking it’s view to others in essence. It would be like putting plastic trash bags over a traffic sign. If I wanted to swim, just stop the boat and jump in. You don’t need to tie to anything. Just make sure your not the only one in the boat when you do it 😂