It's common knowledge that spending time surrounded by trees and plants can improve your energy levels. If wandering around town has worn you out, Platos Academy Park is a perfect place to stop and recharge your batteries.
When you've spent some time at this recreation and green space in Athens, why not check out Parthenon, Acropolis Museum, and Ancient Agora of Athens? They're close to Plato's Academy Park and also popular with tourists.