There are several main walks in the Dept of Conservation Mimiwhangata coastal reserve. This is a 1 hour loop walk from the main carpark by Mimiwhangata Bay. There are toilets and a big information sign with map at the large grassy carpark beside the rangers house. A track goes to the beach, and then north along the beach. A style cross the fence and across a paddock to a 4WD track up the hill. There are amazing views from the hilltops. The track drops down to another beach. From here you can continue around the wetland, or (as shown on the route below) back up onto the hilltops up to a trig point at the very top of the hill (about 90 metres asl). From there follow the wide grassy track back down to an inland route back to the carpark past a lodge (which can be booked through DoC for overnight stays).
Note that tracks in Mimiwhangata are currently not well marked but you are unlikely to get lost on this route. Leave all gates as you find them as there are farm animals in many paddocks.