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.
This was one of the highlights of our trip. Where else in the US do you get to walk across the crater of a volcano. It’s a great hike but the crater has no shade so bring water and be prepared for some moonlike landscapes. You used to be able to cross the crater and head up the other side but the earthquakes in 2018 have destabilized the far side of the crater. Now it’s a there and back hike but still amazing!!
Again, guide is useful! This cave has a terrible history. The guide pointed us an arm bone stuck between the rocks from when someone was falling... there is a collection of broken skulls in the grotto too.