Thoughts and advice on Greece in November?

My fiancé and I are looking into booking Stella Island in Greece for our Honeymoon and would love some input from those who have stayed there or gone to Greece around that time of year! We’re getting married on November 1st and would be leaving that Monday, Nov 3rd (arriving Tuesday the 4th). The plan is to stay at Stella Island for 5 nights and then go to Santorini for 3 nights.

1. My only real concern is the weather this time of year. Has anyone been in late October or early November? I know it starts to cool down. We would be ok if we had some 70 degree days. I’m curious if anyone has gone and feels like swimming in the pools would still be a possibility. I can’t really tell if the main pools at this resort are heated. Any insight into weather in general would be lovely.

2. I see a lot of things shut down starting in November. Do you think we’ll have a hard time catching a flight or ferry from Crete to Santorini? We’ll be staying at an Airbnb in Santorini- do some cafes and restaurants stay open? Did anyone do any specific activities in Santorini they enjoyed or recommend? We’re also okay just walking the city because it looks beautiful.

3. Should we make time in the trio for Athens? We don’t have one scheduled for now and hear mixed reviews. I went to Italy a few years ago and spent the entire time in Rome. In hindsight a day would have sufficed, and I hear people say the same about Athens.

4. Literally any and all input, advice or experiences would be so welcome!