We decided to go to Ao Nang which was a mistake.  Not a huge mistake but very quiet and dull after Ko Phi Phi Don.  The beaches aren't as pretty, it is small and there are few people our age (mostly families).  We did stay in an amazing hotel (we splurged and paid $25).  we were excited about having air conditioning, but then there was a huge electrical storm and mad rain and all the electricity in the city went out and that was the end of the air conditioning.  The staff passed out candles and we sat in our room playing cards until the power came back on.  After that we decided that we had had enough of Ao Nang, so we headed back to Ko Phi Phi.  Always a good time.