Hi I want to go from Heraklion to santorini for the day the first week in September. Is it advisable to book before I leave the uk as I believe I have seen something on the forum that said tickets sell out quickly. Also, is it better to do your own thing when there I.e. Bus to Fira, Oia etc or is it worth doing the day tour that is offered on www.ferries.gr and takes in Oia, Fira and a swim? Probably prefer to do own thing but worried about availability of transport if busy.
Any advice would be welcome. There are 3 of us travelling.