I don't know where the RSSC hotel is in Athens, but depending on location, you might be better just to do it on foot. You could see the Acropolis, and/or the ancient agora, for example, and have time for a little lunch, or maybe just a souvlaki on the go.
Wendy ------ Booked: Uniworld Egypt, 2015 Tauck Amsterdam to Budapest, 2016 Paul Gauguin, Societies & Tuamotus 2016
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