What comes to my mind is to put wireless mics on two of them, and get some of their conversations while they ride. I would probably seed the conversation in advance with some selected topics that would likely lead to either funny or pithy commentary.
Adding some POV cameras to one of the bikes might be nice.
I am of the school of thought that documentaries are “found” in the editing process, that you go over all your assets and figure out a narrative thread and then build to that. That’s not to say you don’t start the project with a point of view, or that you don’t steer it by the choices you already made in who, what, where, and when you shoot. But that the story sometimes evolves beyond what you started with, or goes off in an unexpected direction, and then it gets entertaining, because you’re learning something new along with the audience.
So, what is the point of this ride? If the previous program disappointed the client, I could maybe see why, if all it was was montage of riders without a true narrative thread. Beyond the mild thrill of seeing pictures of yourself, that would soon get really boring.
Examples of themes that you could play with would include:
If this is an established run, how does the “new guy” who’s never done it before, keep up with the experienced riders? Does he fall behind and get lost? DO they coach and encourage him/her along the way? Or is it very competitive? If it’s truly a race, can they discuss strategy? What goes on in their minds while riding? Can you get some commentaries from those folks, grading the newbie, during rest/water/pitstop breaks, or after the thing is over?
Is the run about the destination? What about talking about the anticipation along the way, the expectations?
Is the run about what you find along the way? The terrain, the sights, the people?
With those ideas, it could be you could salvage the original program just by adding-in voiceover and on-camera interviews of recollections and anecdotes with some of the participants.
Or, you could apply these concepts in shooting the new version. Create a narrative with a 3-act structure. Beginning, middle, end. The beginning can be a question: will Joe Spokes be able to make the whole trip, and in what condition? Or it could be something like: “They are the seven biggest hills in what’s considered a very flat state, and we want to see the view from each of them to learn about the land and people around them”.
Or: “This is a run my late father used to take, and this is my first time following it myself. I want to see what he saw, feel what it was like, and maybe reminisce a bit”.
To produce something like this you need good planning and logistics, and usually more than one camera. You need a camera car and/or bike travelling along with the group, an advance vehicle that can scoot miles ahead, deploy a camera and sticks to get them driving by, using high, normal, and ultra-low angles, then repeat. And it would be great to have POV cams and wireless mics on one or more of the bikes as well. This all obviously ups the cost and complexity of the project, but the likelihood of a worthwhile result is much better.