Quite by accident I discovered this new little museum down near the end of Thanon Silorn, just up from the State Tower in Bangkok that has Sirroco Restaurant on the 63rd Floor. It is a delightful 3 story building with an array of colourful and interesting seashells from all over, arranged in ecosytem groups. There are signs in Thai and English and even a children’s hands on display in a sand bucket making it very child friendly.
The staff were very friendly and the museum on a Sunday very quiet, though I would suspect that weekends with schools groups is rather more busy.
And, of course, they have a little gift shop section with trinkets and souvenirs made of shells. I resisted the urge to buy any. 😉
Address: 1043 ซ.สีลม23 แขวงสีลม กรุงเทพมหานคร 10500, Thailand
Phone:+66 2 234 0291
Hours: 10:00 am – 6:30 pm
Entry fee was a reasonable 150 baht for Adults and 50 baht for children.
Always Restless Feet 
Oh….my little heart goes pitter patter when I look at your photos of the sea shells. I collect. The Museum shells are awesome!