Halswell Domain is a large public park at 324A Halswell Road, Halswell, Christchurch, rated 4.5 on Google from 1180 reviews. Its listing says the domain has facilities for Scouts, rugby league, soccer, softball and cricket, among others, and is home to the Model Engineers, who run large model trains at the weekends. The website link goes to the council's general site, which says nothing specific about the park.
A good local domain works for many people at once: sports clubs on the fields, families on the paths and playground, and walkers and cyclists passing through. Before you go, check whether a club has the fields booked, since match days can fill the car park and sidelines. Weekends are the time to see the model trains, so plan a visit then if you have children. Bring water, a hat and sunscreen in summer, as open green space has little shade, and keep dogs under control around sport and children.
For sport, a family outing or a walk in south-west Christchurch, Halswell Domain is a well-used local park.