We have not yet booked our ferry from Phuket to Phi Phi. We are staying at the Holiday Inn so we were thinking of using Andaman Wave Runner. Should we book in advance or at the pier? If I book online do I need to print anything out or can I show the confirmation on my phone? Which pier do they operate out of? I heard they throw your luggage in a large room. Is that safe or should I buy a lock? Has anyone used their airport transfer?