We will be in the area of Mycenae, Epidavros, Argos, Tiryns, and others I'm sure I'm missing. We will already have been in Athens, and we will be going to Nemea, Nafplio, Delphi, Monemvasia, and some Cyclades Islands. We will probably skip Corinth, in favor of going to Nemea. (Just trying to give you a sense for what other kinds of sights/sites we will see.)
We have 2 days (separated by 4 days) to do this. So, on a Monday (which is relevant, since the Nemea museum is closed on Mondays), on our way from Athens to Nafplio, we will see the submersible bridge at the Corinth Canal and then go to one or maybe two sites. On our return, which will be the following Saturday, we will leave Nafplio and visit Ancient Nemea (ruins and the museum, both with a guide) and tour the Pavilou Estate Winery. We're thinking of leaving Nafplio 10:00ish to see those sites and in order to be back in Athens 4:00ish.
So, my question is this:
Please make your case for one or maybe two of the sites for us to visit, on the Monday, on our way between Athens and Nafplio. We are not of the mind that we have to see everything just so we can say that we did, so we're looking for things that are unique instead of "just another ruin". We will leave Athens 9:00ish, and we would like to get to Nafplio 3:00ish.
We are a family of 5, including our 3 young adult "kids" (22, 18, 18). And, we will have a rental car.