IMO you should not plan to go to Phi Phi islands so soon after this tragedy. The island is tiny and the devastation is horrific as far as I can tell from the news photos. the small population of Thais as well as the non-Thai business owners have lost shops and homes. The central part of town seems to be destroyed- even if your hotel were technically up and running, I cant imagine that you could relax there amid all the loss. Not to mention that the water quality may not be as pristine as it once was. I enjoyed the time I spent on the Phi Phi Islands, but would recommend that you vacation someplace else at this tiem. Viet Nam has beautiful beaches and was not hit by the tsunami.