A 14 hectare park located in North St. Catharines bounded to the East by the fourth Welland Canal; West residential community of Port Weller; North by Lake Ontario; and South by Lakeshore Rd.  It was involved in many activities including housing for equipment during the building of the Welland Canal; tended gardens and bird sancuary.  Reforrestation efforts helped restore the park.  Named after Mary Malcolmson leader in Girl Guides.