Koh Phi Phi is a paradisiac but hyper touristic island in between Phuket and Koh Lanta. If you are looking for getting wasted, dancing on an MTV summer hits playlist and getting a nice sunburn here is your place. It is a sort of Magaluf for Asia and it is not a compliment!
That being said, you should go there for a day trip at least. The main 3 sightseeing points are amazingly breathtaking and worth all the cons.
I went further up to the North to check out 3 others sightseeing points mentionned on maps.me. Forget about it, there is literally nothing to see and it is a 5-hour walk in total. Some paths are quite tricky and scary. You have to make your own way through the jungle pushing trees out of your way and hoping no snake is going to bite you!