Ok - obviously there are lots of great, upscale stores to explore. Also fun nooks and crannies including a section for Thai designers (which is also next to Greyhound - a very happening, local restaurant that's not near any other restaurants and worth checking out (get the sashimi salmon with spicy seafood sauce, they're known for it).
There is also a hodgepodge shop that reminds me of Urban Outfitters - Another Story. Another Story has local artwork and lifestyle/home type items from around the world. Inside the store, there's an Issaya Patisserie (with unique Thai-esque flavored macarons - but they have a better location at Central Embassy). And there are several coffee shops worth exploring - my fave is Roast, they have fun drinks and delicious brunch.
Jones the Grocer was another decent brunch spot close to the grocery store, Gourmet Market - where you can find most American/UK/Japanese items that you need. The area is incredibly international. Of course, there's the usual mall food cour that is quite good - but not quite as good as the one at Central Embassy.
What to do before/after a trip to EmQuartier?
So, if you're in Bangkok for vacation, you're likely on there a few days, a week if you're lucky. You could easily pair a morning/brunch trip to EmQuartier with...
Quit my non-profit career in a fit of YOLO rage. Blessed enough to go from wanderlust to wanderslut. Collecting cities & countries, not men.