Hong Kong Science Museum is free on Wednesdays, or about hkd20-30 on other days. Hong Kong Museum of History is free on all days, unless you want the special exhibition, then you may have to pay. These two museums are situated close to each other so it makes sense to visit them both in a day. I would suggest a minimum of 3 hours at each museum. Hong Kong Science Museum is the better place for kids for sure, even adults will learn a few things here.

There is a snack room, but no food sold there, just a vending machine with drinks and a microwave- so my guess is you are expected to bring your own food. All the cafes are way across the street from the museum park, so don't repeat my mistake, take some food with you.

Yes, Wednesday is free. That's a very good reason to avoid visiting on that day, as it will be even more crowded than usual.

That is not hong Konkani,, Bid