I'd love to do a self-guided tour, where they carry your luggage for you, but you cycle on your own during the day. In my case, that'd be either with husband or with the whole family. But I can't afford hotel/motel accommodation, and even if I could I probably wouldn't be willing to pay for it if there was a decent campsite near the route. I'm not at all interested in planning the route in detail, but thinking about it, I think that's because with children my options are so limited - avoid hills like the plague, even if it's more boring; must find campsites/accommodation closely spaced together, because we only do short distances etc etc.
At the moment, I'm only really thinking about family cycle touring, so I would want:
- transport of baggage;
- maps and guides;
- emergency pick-up if things went wrong, and it got late and children were very tired and couldn't go much further;
- cycle hire to avoid the hassle of transporting 4 bikes at once (which is soooo much more hassle than taking just one or two).
I think the trick with children who can cycle but probably can't keep up, is a tandem with child crankset. Extra wow and fun factor, but when they get tired, they can be treated as luggage and just dragged along. For you as a business, you could make it viable by hiring it out to adults if they wanted it, too.