The Sand Castle is enclosed on three sides, with the Keeper standing guard to the only entrance. Look at the base of the Keeper, but watch out for his reaching arms!
Cache is beyond the Rabbit Valley area off of I-70 in far western Colorado. Follow the trails, and proceed past Castle Rocks. Stay on the trail. High clearance vehicle preferred, and don't attempt after heavy rain or with significant snow on the ground. Cell coverage non-existent at cache. Congrats to Rojo464 and CJ for FTF!
Additional Waypoints
R06CVZN - Castle Rocks
N 39° 09.549 W 109° 02.121
Camping, picnic and restrooms