No persons, except such as may be designated by the Director of Public Properties shall place any boat, float, raft or other watercraft of any kind, on any lake, pond or stream is any of the parks or land or go upon any island therein or touch at with a boat, or land at any point or place upon the shores of any lake, pond or stream not designated as a landing place or occupy in any manner the slopes between the water line and footpaths or driveways.