Lesser known spots in Bangkok

Hi all! I'll be visiting Bangkok for the first time in a couple weeks' time, and I'm looking for places that are authentically local! I very much enjoy seeing places that locals like to go, such as traditional marketplaces, non-touristy malls, or just good food. Google search always returns the touristy spots, so I'd really like to have some relatively obscure recommendations!

Would you mind helping me out? Thanks!