This cache is the bonus final for the Moe's Critter's Adventure Lab series. To obtain the coordinates, you must complete the series in order, and once you do, the fifth and final adventure lab will reveal the keyword for this bonus cache. The series takes about an hour and is easily drivable (~15 miles round from start through completion).
Please rehide the cache very well, as it is located a short distance off a walking trail in Swansea. Certitude will provide suggested parking coordinates once the correct answer is input. Hope you enjoy the series and this bonus cache!
You can validate your puzzle solution with certitude.