We love the shell museum because my child loves shells, having visited now four times. However, even if you don't have a resident shell collector in your mists it is actullay interesting for a visit. They have a really decent collection of shells with most described in both Thai and English. They also have the golden pearl which is their claim to fame but unfortunately it is rather underwhelming and looks like a giant peanut, but still worth a lot of money so nothing to look at but if someone gave you one worth keeping.
The facilities are rather run down which is a bit sad, hopefully they will do a revamp soon. So, it won't set your world on fire unless you love shells but if it is raining and you are heading down that way drop in, the kids probably will enjoy a visit to see some of the large sized shells and crayfish they have and they have a shell shop upstairs if you want to purchase one. This in itself is worth a look as they have some chank shells on sale and some of these are worth over $20,000. Don't drop it as you'll own a broken one.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.