This is one of those questions that ultimately ony makes money for Attorneys..

Given the multitude of amusements to gain access to that are obviously involved, it would seem to me that it's ultimately going to end up affording ingress and egress other than just by foot, and quite possibly by any other means imaginable as well.

I would say therefore, that the question of the easement and its' "use" is probably going to be more dependent upon the behavior of the people trying to exercise that use, than it is of the easement itself. The idea of drunken parties comes to mind (picnc tables), along with the occasional hand hauling of a saiboat or a sailboard across the common area to the riverfront, maybe even rollerblading or skateboarding or bike riding if any paved paths are wide enough.

It's a little bit more complex than just dealing with the wording on the deed as to what the easement is "for", because when you get around to telling somebody they CANNOT use "it" for whatever THEY are doing, it's their behavior you are questioning..