Tentative Itinerary

Day 1: Outbound.
Columbus --> Philadelphia --> Zurich (why Zurich? I've no idea) --> Athens.
Day 2: Athens.
Check in at Athens International Youth Hostel. Eat at a taverna and get my bearings.
Day 3&4: Athens.
Wander the Acropolis, Acropolis Museum, and the National Archaeological Museum of Athens.
Day 5: Athens.
Wander the Monastiraki flea market. Day trip to Piraeus or Marathon.
Day 6: Thiva (Thebes).
Visit Leuctra where Thebes defeated Sparta in 371B.C. (maybe also Haliartus[Aliartos?]). Check into Hotel Niovi in Thiva.
Day 7: Thiva/Delphi.
Wander the Archaeological Museum of Thiva. Drive to Delphi. Check in Hotel Athina. Hike one of Mt. Parnassos three peaks.
Day 8: Delphi.
Wander the site and museum.
Day 9. Delphi/Olympia.
Drive to Olympia. Check in at Hotel Kronio. Wander site & museum (if time).
Day 10: Olympia/Messinia.
Wander site and museum if not finished. Check in at hotel in Langada Pass (if not burned up in forest fires).
Day 11: Messinia/Sparti (Sparta).
Wander Ancient Messenia (Mt. Ithome).
Day 12: Sparti.
Wander the Archaeological Museum of Sparti. Explore Eurotas Valley.
Day 13: Sparti.
Explore Eurotas Valley. Hiking in Taygetos.
Day 14: Sparti/Gythion (port city of ancient Sparta).
Wander through Mystras. Explore Eurotas Valley.
Day 15: Gythion.
Wander, eat, swim. (Maybe Diros Caves or Monemvasia).
Day 16: Argos/Corinthos (Corinth).
Wander Acrocorinth and Ancient Corinth.
Day 17: Inbound.
Drive to Athens. Athens --> Philadelphia --> Columbus