You should definitely have a walk at sunset at OAKA stadium, which was used for the Olympic Games in 2004. Its architecture by Santiago Calatrava highlights the place. It always open and full of people running, biking, skating. Near the Eirini train station (green line).

The main host of the Athens 2004 Olympic Games

2004 Athens Olympic Stadium by Santiago Calatrava

Olympic Athletic Center of Athens "Spiros Louis" is the main sport center in Athens, with a lot of sports events over the year.

Sports, concerts,e.t.c.. The stadium in which the 2004 Olympic Games took place.