Is there more than just Santorini and Mykonos in Greece?
Yes!
THere is so much more to visit in Greece.
Besides of many many islands. the Greek mainland is of gratest interest. Most of the Greek mythology and history is written on the Greek mainland.
Nauplia, the first Greek capital or athe oracle of Delphi. The Olympos mountain or Mekedonia,Thrace and Epirus ...
The list is huge and always depending on your interest.