I did not say you must allow access. What I said, and I believe it to be true, is that if you allow access, you cannot dictate flyfishing only because you own only the land to the mean low tide line. You don't own the water so therefore you cannot dictate the regulation of that water. You are not speaking of a landlocked piece of water, I assume, therefore passage by water on Puget Sound is a Public Right. Fishing in the water or on the water by boat is regulated by the State. The rules, according to the enforcement officers are very clear even though you need a lot of time to absorb the Washington State pamphlet. You could, however regulate the taking of shellfish on your land because the shellfish reside either on top of the land you own or beneath. That is a common practice. That being said, if you posted a sign stating access only by permission, when you gave that permission, you could convey your wishes however I doubt you could enforce a flyfishing only rule on you portion of the land. It would be an interesting court case.