If you have time go for a trip to the other side of Bangkok. You can see there a different way of life, crocodiles instead of dogs by the houses, fishermen, rural everyday life. You can spend there a few hours and watch around.
Many people living in Koh Klang work in Krabi. This is an island with no tourists, visitors just come by day by boat. There are many tuk tuks offering a ride around the island, they will show you everything and most of them speak good english. Very nice people live here and it's considered to be authentic Thailand.