Did the Kong Keo tour and thought it was great. Good vehicle, nice lunch at a restaurant, all entry fees included and Kong is a bit of a character. Well worth it for us. We did another tour the following day (Hmong village, hot springs etc.) and thought that was excellent as well. The Jars were fascinating and mysterious to me. How did they carve them out of such hard stone? Look for the one next to the bomb crater, From memory at site 1. It's right on the edge and upright but the shock cracked the back part off, but didn't crumble the jar.