The MOCA is a private museum by a tech taipan in the middle of the bus station nowhere of North Bangkok - but totally worth the Grab ride. Actually, it's one of my three fave museums in Bangkok now, just after the National Museum.
Very well designed, with a great infrastructure and conducive architecture, is it what museums should be. I liked the traditional collections the most (splendid khon mask collection), as I am not a fan of contemporarily famous Thai painters. Thawan Duchanee doesn't do much for me, but he *is* the most imporant one, and the MOCA has the best collection of him, well presented - and if interested in Thai art or even Thailand, that is a must see. (The dismissiveness of some of the Western reviewers here of this as kitsch is inappropriate, although yes, the proclivity towards, er, barechested women is very noticeable indeed.)
But museums today must be a bit more, and this is a museum designed for the InstaTok Thai crowd, which therefore flocks to the museum as well - great selfie and portrait ops, such as a traditional bench and an installation where Dali, in a Thai outfit, paints YOU and that is reflected in a mirror. Kudos!
In addition, I really enjoyed the infrastructure as I mentioned, from driveway and pickup to entrance to - and this stands out - both cafe and gift shops. I don't know any place in Bangkok that gets all of these right, except the MOCA. The cafe serves great coffee and tea, and not only good bakeries but excellent little lunches, just what one wants in such a place - on beauiful tiled tables with iron chais, just lovely. The souvenir shop has it all, from the cheap to the expensive. This reminds me of, say, the National Gallery in London or the top museums in Doha.
The MOCA is not cheap but well worth the price. Notice that "seniors", which is people above 60 (!), enter for free.