Visit the Acropolis of Athens and the New Acropolis Museum. Continue for a walk in Plaka, the most touristic part of the city, Syntagma and the Parliament, which is downtown Athens, National Gardens and the first modern Olympic Games' Stadium, Hadrian's Arch and the Temple of Zeus. There can be a stop for snack (like souvlaki). The tour can be extended for a visit to the Archaeological Museum (the most interesting museum regarding the evolution of art in Greece from prehistory to late roman times), shortened or altered, depending on your interests.