I had a great time, this is my point of view from a chronically ill person , who also was a little sick on that day. First thing you have to be prepare and listen to your body. I did the large group tour, but there were 8 people and a baby. I liked the hotel pick up. The ride was long, but not uncomfortable. We did had a stop and some people in the group wanted to do the shooting. I actually enjoyed the stop in order to stretch and use the restroom. We could also grab a small breakfast bite. It took us 2 hours & 45min to reach the tunnels because of traffic and the stop. Once in there the walk was not so bad, but it was very hot. I was able to do 2 of the large tunnels and keep up with everyone. Please bring a small towel to clean your sweat and a fan to cool off. Mosquitoes repellent is a plus. I recommend cargo shorts to put your items and have your hands free. Backpacks make it difficult and you can leave them in the car. Elio was our guide and was great and well as the driver. He was patient and friendly. I didn’t mind waiting for the rest of the people to do the shooting since I got to see it, I recommend to bring earplugs since is loud and you don’t get ear protection if you are not shooting. you can also wait by the vans. The also sale Viet Cong sandals for 110,000VD. The group in the van was fun and friendly. It took us about 2.5 hours to return. Please prepare yourself when you visit to have a great time, because it can be unpleasant.