Let Wyong and Gosford be two regions under the central coast. Build them up as destination articles, and perhaps develop one or two sub-articles that tend to be major tourist destinations
Let every suburb of the Central Coast develop its own article. If there is someone prepared to develop the content, why not?
Let the Central Coast contain the regional information. Develop Gosford, Wyong, The Entrance, and other popular destinations as their own articles. Ignore Gosford and Wyong as regions, and just treat them as suburbs/towns like any other.