Another very popular activity in Chiang Mai is a cooking class. Definitely recommended! You'll head to the market with a small group, get an introduction to typical Thai herbs, spices, and ingredients, and then prepare several dishes of your choice — which you’ll then enjoy together. You eat what you cook.
There are dozens of options — just Google “Chiang Mai Cooking Class” and you’ll be served a whole menu of choices. And of course, they’re all “organic”...
You can choose between a morning or afternoon class, followed by lunch or dinner, respectively. Pay attention to the location as well — a few schools are in the city, but most are located in the countryside, such as the lovely Smile Organic Farm, where you also get a farm tour. Expect to pay around 800–1000 THB per person.
A full overview of cooking schools is available on Get Your Guide – Cooking Classes.