In front of Tu Quynh Pharmacy at 230 Grand Street there is a fruit stand which will open a ripe durian for you and put it in a container. There's no seating area but you can eat it outside or bring it into your home or hotel if you dare, ha, ha. I like eating it outside somewhere to avoid the smell while eating it and not upset my housemate by bringing it home.
Tonight I had some and I am in total heaven. I bought the durian first and then a man opened it up for me.
Both times I've done this I go when I'm not super hungry and then I don't overeat it. I find I digest it well in this more moderate amount and don't feel sluggish from it the next day as some people report feeling.