This year, I found out that I could run a mobile hotspot off my phone and set up a minecraft server. I got a group of about six students to team up and play minecraft. I took on the role of the team leader and we quickly produced a decent fortress. The communication and teamwork inherent in this type of gameplay lead to a very productive bus ride and very few behaviorial issues. Which is nice.
In the end, we had a well oiled machine of gatherers, designers, builders, and hunters. We planned our next builds around breakfast and created during the long hours of monotonous bus travel. We only ever had any trouble near the end of the ride home when two overly sleep deprived students began an in game conflict and eventually decided to rage quit.