Pick up an historic town walk guide (http://www.portwakefield....) from the caravan park or the motel. Even just driving around the town will give you a feel of how many old sandstone structures there are around town.
Courthouse Museum
War Memorial Arch
Old Train station and railway bridge
Port Wakefield Wharf
Whoever decided on Port Wakefield as the site for mineral export from South Australia obviously had little vision of the nature of what ships would become. The wharf at Port Wakefield is a parallel wooden wharf, with deep water, about 5m wide to the mangroves on the other side. It is worth a look, and it is also possible to launch your boat here