Ko Phi Phi is a pair of islands in Krabi Province.

There are actually two islands here:
* Ko Phi Phi Don is the populated island.
* Ko Phi Phi Lai (also known as Ko Phi Phi Leh) is the smaller island to the south popularised when parts of the movie "The Beach" were filmed there - although it's uninhabited apart from bird nest harvesters and a few Maya Bay wardens, expect plenty of tourists.
Although rapidly becoming less and less attractive due to the masses of tourists as well as the construction on the island, it's still a very beautiful place to visit, and is one of those places everybody should go at least once in their lifetime. Although the beaches are not the best in Thailand, the place has a good vibe and nightlife and there are dozens of dive shops to choose from.
Ko Phi Phi was devastated by the Indian Ocean tsunami of December 2004, when nearly all of the island's infrastructure was wiped out. Services like electricity, water, Internet access and ATMs are up and running again, but waste handling has been slower to come back online.
Get in By air
Destination Air Shuttle direct seaplane transfers from/to Phuket International Airport and other popular Andaman coast destinations. They often run a low season promotion for transfer from Phi Phi to Phuket Airport for only 2000 Baht (high season is 6000 Baht). This is a fairly good deal considering the ferry (400 Baht) plus taxi (700 Baht) to Phuket's airport will run you around 1200 Baht.
Get in By boat
Ferries leave from Phuket and Krabi daily (several times a day during the high season). Tickets are 450 baht to/from Phuket, Krabi (390 baht) or Ko Lanta, and if bought in advance should include transport to the pier. Open tickets (you can fix the day at a travel agency on the island) are 400 baht, however there are rarely any advantages with buying open or return tickets, whereas one-way tickets are a good way to avoid hassle and often end up costing less overall.
Not all ferries are created equally. You can often take your ticket from a travel agent and apply it to a nicer ferry. Talk to the locals and find out what is the best ferry to take.
Get around
Long-tail taxi-boats ply between all beaches; on Phi Phi Don, you can also walk to any beach. From Ton Sai to Long Beach, expect to pay 40 baht/person in the afternoon, at least 80 baht at night. To have a complete boat to yourself, expect to pay at least 100 baht.
Wheelbarrows are used to transport goods, including your luggage if you like. Expect free "transport" from the pier to your room, but not necessarily in the opposite direction.