I’ll start by stating I’ve never toured on a cycle, but have toured extensively by motorcycle, so there are at least some similarities. Lots of great suggestions already and one I’d like to put forward is to have a drying room in addition to the boot room. It’s very comforting to know that your destination has somewhere to dry kit efficiently after a long soggy day and not have the prospect of getting back into, or carrying damp gear the next day. Having repair space including tools is a brilliant idea if coupled with secure storage as already stated previously. It’s certainly one of the things I’ve looked for in trips to Europe and is quite easy to achieve for cycles Given the relatively small space they occupy.
On a slightly different note and I’m sure you’ll have thought of it already, you need to give 28 days notice to your local environmental health office to start a food based business and will need a hygiene inspection. The other thing which will get you noticed is have a really good vegetarian/ vegan offering. Word of mouth is a very powerful thing, as is reputation.
Hope that helps and the very best of luck. It’ll be hard work, but worth it.