Depends on the goal of the tour. If you want to document it with video an action cam makes sense. If you don't why bother.
I use a GoPro3 but my work recently bought 4 GP7's to play with to document our therapeutic cycling program. Very cool camera with touch screen, 4K and a neat 30sec capture feature.

If you do choose to use one, don't run it continuously. High def video in big files is super hard to process and will often freeze the editing program. It's also a little boring watching a run on video from one perspective. Try shooting short bursts of interesting stuff and moving the camera to capture different angles and make fairly short transitions of 4 - 8 seconds. You tube analytics says people rarely watch more than 3 minutes of a video.