The more you venture into the suburbs of Bangkok, the more Thai things become, and the more unusual things there are to see. Buy a ticket to Samut Sakorn. Whilst you wait for the train, take a look at some of the foodstalls. What's on sale would jolt the very dead from their infinite stillness. OK, try a nice bag of fried larvae.
Thai trains dawdle, but there's plenty to see.
You are so close to the vendors that you could buy a kilo of catfish just by stretching out your hand. Before you go back to the station, pay a visit to the unusual Chinese temple on the front. I've been there many times, and have very rarely seen Westerners there . Curl up with a good book. Yes - not a bad idea, to get away from it all and just have a day reading.