Parks, green spaces, and squares are important places for people to engage in daily leisure. These are reasons to set the Wayfinding Design Guidelines to expand Taiwan’s overall public construction of fair and convenient use of these spaces. We used expert focus groups meetings, and case surveys in thirteen sample parks in Taiwan, and three parks in London, England to analyze the design concept of accessibility and signs using for people with different visual, hearing, physical or cognitive limitations. Four types of signs, orientation, directional, identification, and regulatory (description) signs, their planning principles, and the layout rules for entrance, paths, and service zones were proposed for developing fair usages of public facilities in the open space in Taiwan.