Most of the residents around here think the wondrous marsh preserve IS a joke.
You mean a actual large majority, or just the ones you speak to that agree? If it bothers you all so much, why don't you get together and try to have the protection lifted? I would think if it was so unpopular with the residents, it would be a sinch to have your state repeal the conservation area status...
While you may not agree, the fact remains that most of these areas need to be protected. While you may not think so, the enviroment is important to many people, and these areas cannont be replaced once they are gone. From what I read on your links, it appears this site is part of a vast network of marshland that dates back at least a 1000 years, and I am sure is home to many species of wildlife, other than your mosquitoes, that wouldn't be there otherwise. Even if they repealed all protection of that land as a conservation area, do you have any idea of how next to impossible it is to develop anything on marshland? It would likely remain there, but not be protected by the government. You would probably just end up with the same thing, just less regulated.
Also, in the story you linked, it would make sense to me that if the only access to the wetlands in that case was over the people's property mentioned, their property is still private, and they would be able to refuse access to people.