We were fortunate enough to go on a day when the JSA was open. We were even luckier to see a tour going on across the border at the same time as ours. Overall, the guides (both our primary tour guide and the soldiers who guided us at the JSA) were full of stories and interesting facts, and we learned a lot from this. While at the JSA we were able to enter T2 and within that building, we were able to cross into the North Korean side, which was kind of surreal. The other sites aside from the JSA were all pretty interesting and provided a fuller view of the DMZ as well as a more complete understanding of the conflict and the current status of the day-to-day reality of these two countries. The Third Infiltration Tunnel was REALLY cool and shows the rather chilling reality of the war that's still going on, even if it's just on pause. Be prepared that while you can take pictures in every other place, you can't take photos in the tunnel or the military base right before you go to the JSA (you CAN take photos at the JSA though), and the tunnel is not an easy climb back up. You have to walk up a ramp to exit the tunnel and it's pretty long and at a rather steep incline, so be prepared for that.