Kitty
Don't believe anyone who tells you the Grand Palace is closed (until you get there and it is) there are touts that hang around and just want you to do a tour with them.
One of my absolute favourite is a boat on the Klongs, it's fascinating to see how everybody lives on the water, just don't wear your best frock as it will get splashed with the river water. Enjoy !!
Cheers Geri