Short city tour by bus in Koblenz?

Dean, the old section of Koblenz is not really all that big so for that reason I've seen any number of walking tours but no hoho or other types of tourist buses. A friend and I easily did our sightseeing on foot. You might head off to the Tourist Info Center on arrival and see what they have to offer for group or self-guided walking tours?

https://www.visit-koblenz.de/en/tourist-information

Thank you, Kathy! I appreciate your input.

I'm indeed coming to the conclusion that we should just take a train to the Stadtmitte Bahnhof, and strike out on foot from there. We will be making a day trip from St. Goar.