Will be on a cruise in September. . Going to be in Athens for a day. Is Hop off hop on bus option that Cruise offers be a good way to see Athens.
In Athens, hop-on hop-off buses can't access major sites, these sites are mostly in pedestrian areas. But you can get off the bus at designated stops and walk the remaining distance.
Taking a hop-on hop-off bus that travels along the main avenues in the middle of traffic and pollution with the goal of staying in it isn't really worth it. You might as well take a public bus from which you'll have a better view for €1.20.
No, a Hop on Hop off bus is not a good idea.
Athens is very walkable but the heat may be a problem. Walk as much as possible and use taxis to go from place to place farther apart. .