Greece itinerary; need advice on transportation Poros to Napflio

Day 10, I don’t think that is realistic, but you will pas right by Nemea, and Arcocorinth en route to Athens.
I would try to squeeze in Mystras, an evocative Byzantine site.

"Arkadia (at villa with private beach)" Just a note on private beaches: they don't exist in Greece (Greek law designates coastline as a public asset)

4 travel from Poros directly to Napflio somehow? Or ferry back to
Athens

There was a time when the only car rental company that allowed you to return the car in Athens was Pop's Car at the port of Galatas (connected to Poros by a short boat ride).

I'm not sure if that's still possible. Check with Pop's Car.

https://popscar.gr/

tommyk5, who knows this area well, might have another idea if he reads this thread.

Otherwise, you'll have to return to Athens by ferry and rent a car. If you have to return to Athens by ferry, instead of going to the city center or the airport, to save time you'll find rental companies at the port of Piraeus.

I agree with valadelphia; stopping in Olympia or Delphi on day 10 is rather unrealistic given the driving time from Tseria.
However, you could stop at the archaeological site of Ancient Messene, which is as good as Olympia (or even better, according to many including me ). It's about a 90-minute drive from Tseria.

https://www.greeknewsagenda.gr/ancient-messene/

A couple of years ago one of my daughters rented with pop's cars from Athens and could drop off in Galatas. So I assume it's also possible the other way round. That would make it easy to go from Poros to Nafplio without making the detour via Athens.

JeanCrete - I should have said semi-private. But previous renters said that they had the beach mostly or completely to themselves. Thanks for the clarification. Beach isn't that important to us anyway. But will be nice for a few days!

I wrote this mainly to point out that any place advertising a private beach is being deceitful. There are many beaches in Greece that you can have to yourself but none that are private (as belonging to anyone else than the Greek state i.e. everybody)

Unfortunately I can't help with Pop's Car Rental as I rented a car in Nafplio then drove to the Argolis and stayed in Palea (Ancient) Epidavrous a lovely beach side town which is a nice option from Nafplio if you want a less touristy atmosphere.

Another time I again rented a car in Nafplio then stayed in the waterfront town of Ermnioni in the far south of the Argolis Peninsula.

There is more to the Argolis Peninsula than just Nafplio and the well known archeological/historic sites and a lot of the area is overlooked but has much to offer as any other part of the Peloponnese.

There are buses from Galatas to Nafplio but I believe there is a transfer along the way.

The other option is a private transfer from Poros to Nafplio which is very convenient but pricey.

I used this company once before that specializes in the Argolis:
https://www.greek-taxi.gr/en/home/

One car rental agency on Poros worth looking into that may help:

https://atticarentcar.gr/location/poros/

I found this in FAQs:

Am I allowed to pick up a car rental in Athens and drop it off in Poros?
Absolutely, yes, since we do offer one- way car rentals, meaning that you can pick up your car rental at a certain location and return it to another.

Maybe they can allow picking up a car in Poros then dropping it off in Athens.

Hi,
We were looking into the same option- Poros to Nafplio and I contacted Pops Car rental and this was their response "Yes you can pick up the car from our office in Galatas and return it
in our office in Athens in Koropi it is next to the airport." Their website didn't have that option, so I would email them for the booking. Hope that helps!

Thank you all for your helpful responses. This forum is the best!