The posted coordinates are for the upper parking lot at Seahurst Park. The cache is not there. Park hours change so only visit during daylight hours or the gate may be locked.
Do not leave valuables in your car.
Solve this puzzle to get the coordinates of the cache location.
Add to North coords: Walnut-Acorn.
Subtract from West coords: (Walnut-Cashew)+Walnut.
Checksum of N=37, checksum of W=24
Congrats to LoisCifer, biotonne88, hessin1, and QazNkids on their FTF!