Well I've never done this trip, but indeed it did get me thinking that once down there, & onto the island it would be nice to have the liberty of driving where you want & not be at the mercy of taxis etc.
However what's the format for booking the ferry? Is there two vehicle ferries..? Is it pre-book only..?
Am I right in thinking one of the ferries leaves from about 30km south of Surat Thani..?
Any trip-info would be welcome..both for my mate & for possibly many others on the forum...

