I really like the Billy Frank wildlife refuge near Olympia - it has an amazing boardwalk you can take out over the tidal flats. https://maps.northwestportal.com/outdoors/#11.88/47.072930/-122.713852?search=true&f=namelc&q=billy%20frank That map has over 18,000 recreation opportunities throughout the state - you can filter by activity (hiking) or pass required to find something near you.