Now this was the unexpected part..
Even though Viking didn't require a negative COVID test to board the ship.. the Greek government did. When we arrived at the port we were asked if we had taken a COVID test within the last 24 or 72 hours. We had not, so they very swiftly and politely moved us to the testing area a few yards away, where we were swabbed, and then waited for our results. We looked at each other with sleep deprived eyes thinking that wow.. this vacation might be over before it had even begun. There was instant comradery amongst our fellow "testees" and within a few minutes we all thankfully tested negative and were on our way to check in.