Where to Honeymoon in Europe

Hello all! I'm getting married in October in France and have a week to go on my honeymoon somewhere in Europe. I'm having trouble deciding where, so if you have been to one of these places, let me know if you enjoyed it and/or where you think I should go!

1. Montenegro

2. Greece (Milos and/or Naxos)

3. Malta

4. Croatia

I'm not completely opposed to Switzerland or Italy, but I'd rather something with crystal blue water, less city and more nature/water, lol. If you know a place that I haven't listed, please let me know. Thanks !!