The Sukhi Thai restaurant is within a 2 minute walking distance from the Panama City Marriott hotel. There is a Sushi restaurant and the Mariscos restaurant nearby. The decor is very simple and one would seem that this is just a cafe - however the food and the service were both very good.
I had the chicken satay and the shrimp red curry and both were made just right. The coffee flan at the end seemed to be more Panamanian - however Thai food is not really known for it's desserts. The total bill came to about $22.00 (2012 prices) including tip - 10% that is added to the bill.
I'm staying in Panama city this weekend and I plan to go back to the restaurant - the only reason I didn't give it 5 stars is because of the decor - the food itself is very good.