My feeling is that if you've no need for any more human contact than you would have if staying at home, then frankly I can't see any reason why you shouldn't go for a trip, Bill.
After all, if you were to stay at home you or Suzie would, as a minimum, need to go out for provisions and have limited contact with others.
I've heard the argument that if away and one were to need assistance that puts others in unnecessary contact, but equally problems could occur at home. It's all a matter of balancing risk. We haven't yet been asked to self isolate unless showing coronavirus symptoms - we've been asked to minimise contact with others and maximise the distance in between.
I go for bike rides in the countryside and see that as being no different to the kind of trips out in your Moho that you describe.
Colin