According to my knowledge, Marton Park in Shantou, Guangdong, China does not appear to have public restrooms or toilets available for use. The park is a popular recreational area with playgrounds, walking paths, and other facilities, but it seems that restrooms are not one of them.
However, I would recommend verifying this information by contacting the park’s administrative office or visiting their official website (if they have one) to confirm whether public restrooms are available.