Your definition of freedom is starting to look a lot like self indulgence. If you want to "open it up" then go somewhere where you can do so in open water, safely and without disturbing people. Freedom has a context and a set of responsibilities; in a civil society you wouldnt have to legislate for it, it would be called respect for your fellow citizens. I have no problem with jet skier's per se, but its not an activity you can indulge in on a small lake without impacting a lot of people. Also I think there is a huge difference between a passive impact and an active impact ie. the difference between the impact caused simply by being there and say projecting 80+ dba two cycle engine noise.
However, I agree that we shouldnt be in the business of protecting people from themselves.
Barry.