We (family of 2 adults and 2 kids) plan to spend 2 nights in early July in Hydra. Prior to Hydra we have 3 nights in Nafplio. We are currently planning to leave Hydra on July 2 to head for Athens. We have a flight that leaves ATH that same night.
It seems that the typical Hydra-to-Athens travel would be to take a Hellenic Seaways fast boat to Piraeus. We're considering the 11:10am departure. Once in Piraeus we would take a taxi to Athens center, put our bags in a locker in central Athens, spend a few hours there touring (we would have already spent 2 full days in Athens at the beginning of our trip), retrieve our bags from the locker, and then take a taxi to the airport for our flight that evening.
But as I've read about the Hellenic Seaways ferries, I've become hesitant for a few reasons. For one, you can't just hang out on the deck outside because it's a fast boat. That means we'll be inside in a cabin with presumably hundreds of other people. This seems like a COVID nightmare if fresh air isn't getting pumped in. Second, I've read sea sickness is a problem. Third, ferries apparently get cancelled due to winds/weather. Fourth, the process seems chaotic for luggage and boarding. If booking business class seats fixes any of these issues, I'd do it, but it seems to only decrease the crowding by a bit.
So I started thinking "Why not take the ferry from Hydra to Metochi instead?" From Metochi I'd need a transfer to Athens city center. I can arrange that in advance. The advantages I see in this approach is it presumably avoids all the issues I mentioned with the fast boat from Hydra to Piraeus. The only risk I see there is really just the transfer driver not showing up in Metochi, which seems like a bad place to get stuck without a ride, since it's so far from Athens and not serviced by much.
I haven't read about anyone doing this second option (Hydra - Metochi - Athens), so I'm wondering if I'm missing something.