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.
Ever seen pagoda on a rock? This is amazing. The place is peaceful and beautiful, the surroundings are nice and natural. If you go early in the morning you can catch a lifting mist that adds magical accent to the place. Best go by motorbike.