The gyros at the unmarked spot on Ermou St (near H&M) is €2.50 and AMAZING. Cash only.

Free WiFi at Syntagma Square park. Great for working outside.

Climb Lycabettus Hill at sunset instead of the Acropolis viewpoint — way less crowded, better view.

Take the metro to Piraeus and walk along the marina. Beautiful and tourists don't know about it.

Happy hour at Six d.o.g.s bar (Psyrri) — 2-for-1 cocktails before 8pm.

The €1.50 koulouri (sesame bread ring) from street vendors is the best breakfast in Athens.