If you want to enjoy your trip,my advice is to stay at least 3-4 days in one place,otherwise you will be to tired.Go from Bkk to Kraby(air asia is realy cheap and is only 1.10 houres fligh,stay at White sand beach,Tipa resort is realy nice(bungalow near the beach)there is also a nice dancing club there ,Luna...until sunrize...than,go to Phi-Phi (by ferry)and stay there at Sea View,is in Tong Say bay,very nice veranda,you can catch sunrize from your balcony....in the evening go to BorBora bar...have fun....but don't miss one camping night at Maya Bay....it's just great....you,your friends(never more than 10-11 people during ther night there,camping fire...barbeque....and the rest is up to you...just have fun(they provide sleaping bags....you will sleap on the beach.... and food and even music),than, is up to you,i have been to many places,but not to the island you want to go.
I hope this is a little help to plan your trip