Visiting Greece for the First Time (Athens)

Hi all,

I'll be visiting Greece for the first time from June Protected content . Can you recommend some must-see places in Athens or some other islands that are not the usual tourists spots? I'm very interested in culture, history, and enjoy the outdoors and natural beauty greatly. Definitely would love some recommendations for quiet and beautiful, romantic places/ beaches.

If you could recommend some good restaurants or activities in Athens or other places, that would be extremely helpful too.

Many thanks,
Ella