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You can go from Krabi to Surat Thani by bus, and then get the boat to Koh Pha Ngan - that's really the only way to do it.
I did the night cargo boat from Surat Thani to Koh Samui, which I wouldn't recommend as it was roasting hot and there were cockroaches. I think it was cheaper than the day boat, but that's not why I did it - it was down to the timings of the buses and boats.
In saying that I wouldn't recommend it though, the journey to Koh Pha Ngan is longer, and their boat was bigger and had an outdoor area, so it might be better...
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