Follow Gaetgol Eco Park → lunch → Oido Prehistoric Park → Oido Harbor Marine Tourist Area → café. KTO gives car legs of about 3.3 km/5 minutes, 8.6 km/15 minutes and 2.5 km/5 minutes, followed by a roughly 700 m/10-minute walk from the harbor to a café.
The park has relatively level deck paths in the source, but weather and tidal conditions can affect outdoor access. Check actual sunset timing, park notices and each business's hours before visiting.