We will be in Athens overnight in October. This is our second visit to Athens and we were glad that we were able to visit the Acropolis the first time. This time we are with Viking cruises and the included excursion ( no charge) provides a bit of a panoramic bus tour prior to a visit to the National Archaeological Museum. An optional excursion ($89) visits the Acropolis Museum followed by a walk through the Plaka District. Since it is an overnight, there might be time to do one each day, but I am not sure of that yet.
Advice, please?