You know a place must be either really good or really bad if it can inspire a song. The Bottle Beach Song is a bit of a hippy cliche but it gives you a good idea about:
1) How gorgeous Bottle Beach is
2) How peaceful the place is and how perfect it is for a beach holiday.
Although Bottle Beach or Haad Kruat/Kruad has expanded from 1 resort offering basic coconut thatched bungalows for $3 a night to 3 resorts with $10 to $20 a night fancy bungalows, it still remains one of the least developed beaches on the island. It used to be cut off from the rest of the island. Now there's a road through to Thong Nai Pan Noi. It remains a hard place to get to and definitely worth the effort.
There's virtually no tide on Bottle Beach. It is great for year round swimming. You can sometimes spot little fish in the sea. There are also some good trails to follow into the jungle behind the beach.
Anyway, without further ado here's the Bottle Beach Song.