I am going to Greece in late March and had planned a very quick two night/one day trip to Santorini, mostly to see Akrotiri and just the general sights. Due to current events, I am considering switching away from Santorini while my cancellation policies permit. I had not been planning to go to Crete as I felt I didn't have enough time to see it. However, my trip already includes ample time in Athens and a four day road trip in the Peloponnese. I don't think a different island would have enough to recommend it in the offseason, and I have plane tickets that I need to repurpose (or maybe I would have considered a trip to Meteora -- although I think Chania will be more in line with our interests than Meteora, however beautiful it may be).
I am quite sure that one day is not enough for Chania, but we did recently do one well-planned day in Dublin and it was super-fun. Any tips/tricks/fave sources of info or guidebooks, since Rick's don't cover Crete or Chania? Any other suggestions for how to repurpose this time? I know things could calm down in Santorini between now and late March, and also given that it is low season, it shouldn't be too hard to make alternate plans, but I feel like early March is the latest I could leave it to, and I doubt I will feel totally comfortable deciding by then, with all the reports saying this could go on for months. Also, I am going with my teenager, and this would terrify him.