Do your own research OP but I can tell you that Vermont does not have a history of caselaw supporting permissive easements.

Vermont has strong property rights and asking a community organization to make you some signs and let folks know they need to behave properly will do absolutely nothing to jeopardize property rights.

Have some faith in your community that it's members (on the whole) want to do the right thing, respect your land, and enjoy the outdoors (in that order).