How was your experience?
This is a GPS controlled "Spy Adventure" around the area of The Spy Museum. We did the one-hour version, and the 13-year old I was hosting said it was one of his favorite things. It took us somewhat over an hour because we had difficulty solving our first clue (duh!). It was a fair amount of walking on a very hot day, and we were pretty sweat-drenched by the time we made our way back to the museum.