Use the cert for the last night. I can almost guaranty the JW will give you a late checkout. Many guests arrive on those Korean Air and Delta flights that get around midnight. Housekeeping is there late. You essentially keep the JW room until the last minute, and really only sleep in the FS. Just leave what you need for the morning out of your suitcase, and you're packed and ready to go to the airport in the morning.

With that out of the way, tell us more about the cooking class. I want to do that the next time I'm in BKK.