We are staying in Rethymnon 13-20 Oct 2017. I've read that some ferries to Santorini stop early Oct & another stops on the 16th. I hate group tours, but is self- guided an option? I know we can fly directly to Santorini from the UK cheaper than getting a ferry from Crete, but if we wanted to do a day trip, are there companies with smaller groups? Will tours still be running then? thanks.