This place is one of Chiang Mai's shining stars. CAMP is a beautiful workspace for students and digital nomads alike that's open 24/7.
NOTE: If you want to get in at night, note that the mall is closed. To get to CAMP, you must use the back entrance of the mall. Before the parking garage entrance, you'll find some stairs that lead to the only publicly-accessible elevator. Go to the 5th floor and follow the hall to CAMP.
You "pay" for WiFi by purchasing food or coffee. For every 50baht you pay, you get another 2-hour slip. WiFi is about 2-15mbps, however, if you have an AIS Super WiFi (about 100baht/month) then WiFi is FREE and WiFi is 50-300mbps! If you're a digital nomad, then you will love it. Go downstairs to the AIS store and ask about it.
The food is affordable (60-200baht), and not bad. The coffee is just OK (80-120baht), but affordable too. MAYA's 4th floor and basement floor has more food selections which range in price from cheap to expensive.
All in all, this place is a GEM! I love it here, and I'm so grateful it exists.