Hi Eric. The part of the property that is designates as the easement is still part of your property. An easement creates an encumbrance on the property of the owner who granted the easement (called the servient property). I would think putting stakes along the easement is reasonable as the person who benefits from the easement will want to make sure that he does not use an area outside the easement. You could talk to the neighbor and suggest alternative methods of marking the easement boundaries. If you don't like the stakes, maybe marking the boundary with spray paint would be less invasive. In my opinion, this is a perfect chance for you to get to know your neighbor and set the tone of your future relationship, which hopefully will be pleasant.