Being that other tourist: Must visit the great Acropolis.

Being that local: Getting around by public transport. It's just that part of town being ancient and still beautiful. Other that that it's not as pretty, just another town!

Only one day in Athens, just to visit the Acropolis. Also visited the market area near Acropolis but nothing worth mentioning. Just heaps of tourists and plenty of souvenir shops. Note from my Greek friend (thanks Bris!), Athens is apparently very dangerous. I'm not too sure if he's using KL as a benchmark or London :D

P/S: The last time I went to The Acropolis, I paid nothing. Free of charge for students with a valid EU student card, half off for the rest of the world. Remember to bring your student card!!