When you are visiting the Phayao lake, opposite Wat Tilok Aram (วัดติโลกอาราม), you would see a number of restaurants facing the scenic lake:
Most of these restaurants serve various order-to-cook dishes. But they are also known for grilled fish:
The grilled fish is delicious and the price is reasonable. However, it is better to go with a Thai native to help you in terms of ordering food.
Below are what we ordered during one of our trips there (I have actually eaten there twice in total):
It consists of grilled fish, roasted chicken and pork, stir fry vegetables and tom yam. The price was reasonable as we went with our teacher who is a native Thai.