We (2 parents, one 8 year old) will be traveling from Piraeus to Syros Aug. 25, returning Sept. 1. I've read the cautions about the difficulties of buying tickets from the US, but since this is high season and both days are Saturdays, I'm wondering if we should buy in advance. FWIW some classes of tickets for these trips already appear to be getting low or are sold out.
Any advice on whether (and HOW) to buy in advance appreciated. Thanks!