This is a really good way to get a quick overview of both the historical and cultural aspects of Vietnam! We had Thanh, also known as Mr. T, as for tour guide. A local, he gave a really incitful overview of the Vietnam War on route the to Tunnels, important since I knew very little. Great English too.
The tunnels themselves are incredible, set amongst the jungle.
The second half of the tour is focused more on Vietnamese Culture and includes a trip to Unicorn Island, with displays of local music and a trip to a working coconut candy factor (my favorite part!) along the way.
There is a good bit of travel involved, approx 5 hours, but this is broken up across the day, and considering the tour van is very comfortable and includes Wi-Fi, it is very manageable.