Are these the 3 best excursions?

1. Delphi/Hosios Loukas
2. Nafplio/Epidaurus/Mycenae/Acrocorinth
3. Hydra

I think, I am not entitled to post here, because the first two were my own recommendations.

What exactoy are your interests?

traveller1959: Yes, that other post is what led me to doing this one.

The more research I do makes me sorry I only have 6 days for this trip.

RonZ: I like archaeology, but even more than that, I love charming old world places. I also like hiking. I would have loved to do Dimitsana and the Lousios Gorge. I also like beaches, but there clearly won't be time for that on this trip.

The thing is, do you prefer to have a small glimpse of a few distant, different location or have a somehow more indepth glimpse on most concentrated areas? For example having the car, you could check Galaxidi half an hour away from Delphi or hike/drive up to Parnassos to check the Corycean cave or even drive to the other side of the mountain to check traditional villages and Argyriou winery or hike from Delphi down to Kirra/Itea or... Not in only one day though.
The same can be said for Argolis area, you could spend a few more days there, explore archeological sites and near by beaches and even drive to one of the near by ports and visit Hydra or Spetses as a day trip.
Decisions, decisions....

I would add Nafplio for its seaside and old town plus the nearby antiquities. Then I would drive to Delphi and finish in Meteora.

Nafplio and Peloponnese http://www.flickr.com/photos/stanbr5...7632094108982/
Olympia Delphi Meteora https://www.flickr.com/photos/stanbr...7645469717811/