Another one proposal for an excursion to the mainland is the Meteora excursion, combining Meteora site with a visit to Thermopylae monument!
By choosing this excursion, now on, you decide to go to the Greek mainland, especially in the Voiotia and Phokida prefectures.
Another proposal in Peloponnese, combining visit to archeological site and touristic hubs is to visit ancient Olympia and nearby Kyllini port in Hlia prefecture.
Next proposal in Peloponnese, as the previous one, in order to combine visits to archeological sites with touristic hubs is to visit Epidavros ancient theater, Mycenae archeological site, and Nafplion harbor in Argolis prefecture.
In this excursion you can explore some other well famous places nearby Athens and to combine visits in touristic places as the town of Loutraki and Corinthos canal, with historical sites as the ancient Corinthos site.