You’re never too old for hide-and-seek, and tomorrow night at Lake Red Rock, the corps of engineers is having a huge game using Global Positioning Systems. Geo caching works by using the technology of GPS to hunt for caches hidden in the area. Bring your own GPS or borrow one from the corps of engineers for the activity. Learn basics to use on your own when you travel, or in your hometown. The event begins at 7 pm at the Whitebreast Campground.