This was something I happened to find purely because I was at the Phuket Immigration Office to renew a visa and I arrived at the wrong time and I had to wait another hour!
Note: I have not done this again and always arrive about 8am and never on a Friday.
So it is next to the road and next to a number of motor bikes waiting to give you a ride somewhere - they left me alone because I told them I was waiting for my visa.
I had a wonderful cappuccino as I waited and watched the world pass me by - a great spot to wait if you need to go to the Immigration Office for your paperwork.
Note 2: Interesting read on Tripadvisor about the delivery of the burger in jail?