The stated coordinates for the geocaching event will take you to the Maryland House rest area located just north of Route 543 in central Harford County. Please be careful in the parking lot as the rest stop tends to be quite busy at times.
For more information on the Maryland House, see http://en.wikipedia.org/wiki/Maryland_House.
The exact location of the meeting will be somewhere within the food court of the Maryland House (depending on business of the food court). While no clue will be provided, we are sure you will have no problem determining the exact location. Hope to see you there...