I think you should definitely look into Greece as well as I've heard that the prices have dramatically decreased due to Covid and their tourism industry has been really affected. We are also looking for some days of vacation in the summer in Santorini as we would love the quiet mode the island will probably be in. Last time we went we had some amazing Santorini tours with a great bunch of people. It was quite busy in the city, but I doubt that these many people will be able to travel now.