The island of Koh Phi Phi and the smaller day trip islands around Phi Phi are truly beautiful. The waters are warm and clear, perfect for swimming and snorkeling and you have probably read this several times before, but I suggest you read this blog before you go to Koh Phi Phi.
During peak season Koh Phi Phi is crazy busy and it has become party central for the single 20 somethings looking to rave and dance on the beach every night until 4 am with thousands of other minimally clad Europeans. The party action centers on Ao Lo Dalom ( beach name) and all throughout the little town in a maze of cute cobble stone streets with numerous bars, tee shirt shops and tatoo shops. The town has its charms for sure, there are no cars and no motor bikes. The closest thing you hear to the sound of traffic is Thai people saying beep beep to emulate the sound of a horn as they pull up behind on you on their bicycles.
If you are a romantic couple or a family or simply beyond the age of excessive partying, then Koh Phi Phi at peak season is not the best choice for you. That said, off season is much more tame and during peak season there are 5 star resorts where you can easily escape the bars and the noise but you have got to book a 4.5 star or 5 star during peak season. A good place to escape this craziness is to book a resort on Ao Nang (beach name) and there are only a handful of resorts to choose from here. Have a good look on Agoda.com as they have the best selection of resorts by a long shot and I suggest you carefully review the resort map feature to make sure your landing yourself where you want to be.