@Jambo-Vista0 - What a great idea for a remote location! have you asked your past guests if that is something they would have wanted? I know a few hosts who are in remote locations and all of their guest either drive their own vehicles or rent/hire a car so they can get around easier. Of course, those places don't really have public transit as an option.
I concur with @Helen3. I'd offer it for an extra fee and make sure you settle on what they want at least a day (or whatever you are comfortable with) before they check in to avoid any confusion upon arrival.
Judy