Ah i just saw the post. So, you will visit acropolis, that might be tiring because many tourists, Agora, Areios Pagos, Plaka neighborhood, acropolis museum, Theisio, Monastiraki (all these are close). That's a must. Then maybe the garden beside the parliament, the first olympic stadium of modern tim...

Darn, 6 is too far away, for me to stop by. I'm only getting out to Delphi.