My family is looking into visiting Greece in late December 2022 through the new year (Dec 23-Jan 8). I understand this period corresponds with four public holidays (Christmas, Boxing Day, New Year's Day, and Epiphany). Our itinerary is still open, though places we are contemplating visiting in addition to Athens include Nafplio, Delphi, and Olympia, along with potentially the Mani Peninsula and an island (such as Hydra, Crete, Rhodes, or Santorini). I'm curious about which destinations would be ideal for staying in during the actual holidays (particularly the Dec 25-26 period, as I understand the archeological sites and museums will be closed), in the sense that there will be museums, cultural sites, or natural sites that are open (or accessible) on the holidays themselves.
For perspective, when were in Italy last December, we spent Christmas at the Valley of the Temples in Sicily (the Mount Etna cableway was also open) and New Year's taking a driving tour of the Amalfi Coast. I'm looking for suggestions of that nature so we don't "waste" those days and are able to get some quality sightseeing or nature exploration in during them.