In December 2016, we did Mexico, Germany, Japan and France. They were all fun, but I liked France the best. There is a neat CM interaction there. We had a hard time finding one of the spots in Japan (at night).
I'm surprised more people don't do Agent P. In each country, it seemed like we were the only group playing the game. It made Epcot more fun for my 4 year old (and the adults really enjoyed it too).