I visited the Phi Phi Islands in Aug 04. I would be careful in going there right now. I live in Calif, and my wife is Thai. I would give you a point of contact in Bangkok to affirm information but I would have to get their permission first. As, a backup plan on your vacation I would consider visiting Changmi, the weather is not as hot as in the south but I think for the time being it is much safer. One of my nieces works and goes to school there. The rest of the family lives in Bkk and and in south Thailand inland. They were not hurt, thank God.
I hope this infomation helps. Write and let me know if there is anything else I can help with. Take Care.

V/r
Sal
Salinas, Calif