Hi there. To go to Koh phangnan from Krabi is a long way to travel. First you need to go by land to the other side on the land (by bus)and from there take a ferry (about 3hrs).
I do not know if you already know this, but on days of full moon partys it is really, really crowded, so probably it is better to stay in a hostel in koh samui and take a ferry to koh phangang. Especially at night the trips are very long (longer than during the day, do not ask me why) and to get a sleeping place at koh phangang you need to go there a few days in advance, because of the crowd (and you do not want to sleep on the beach I guess).
Anyway, good luck and check lonely planet for more tips!
You need to get first from Ao Nang to Krabi and then a bus to Surat Thani and then a boat from there to Ko Samui or Ko Pha Ngan. The easiest way is to go into any travel agent in Ao Nang and buy a minibus through ticket, but govt buses are generally more comfortable (in which case you'll need to go via Krabi town).
#3 somtam2000 has been a member since 21/1/2004. Location: Indonesia. Posts: 7,789
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Those parties are shithouse. Not worth the effort. Bad music, mostly drunk blokes pissing in the sea or on the beach.
#4 travelrock has been a member since 19/4/2008. Posts: 209