Basically, we went to the Cycladic Museum (pictures below) and Benaki Museum (in which I stupidly put my camera in my other bag that was stored in the storage since we're only allowed to bring the smaller bags into the museum).
Had lunch at this cute little gyros shop called Ice Grill. Delicious! If you come to Athens, this is the must-go place for dining. Very casual and laidback, great for people-watching. The prices I thought were pretty cheap. The food? Priceless.