Wonderful seaside route. Best section is the 5+ km from the Flisvos Marina north to the Peace and Friendship Stadium. South toward Glyfada and Voula there are some great sections plus a tram allowing for a one-way run. Video excerpts!
Host to sailing and several events in the Olympics, has been turned into sports complex with multiple activities and facilities. There's a ~3 km waterfront path for runners. Can connect to path headed ~10 km north to Flisvos.