Longkou City, located in Yantai City, Shandong Province, China, is a gourmet city with many delicious restaurants. Here are some restaurants that are considered delicious by local residents and tourists:

1. Penglai Pavilion Hotel Yantai: Located in Donglai Sub-district Office of Longkou City, it is a five-star hotel. There are many restaurants in the hotel, offering all kinds of delicious food, such as Yantai seafood, roast duck, buffet and so on.

2. Donghai Hotel in Longkou City: Located in Donghai Development Zone in Longkou City, it is a four-star hotel. There are many restaurants in the hotel, offering all kinds of delicious food, Donghai seafood, barbecue, buffet and so on.

3. Laizhou Hotel in Longkou City: Located in Laizhou Town, Longkou City, it is a three-star hotel. There are many restaurants in the hotel, offering all kinds of delicious food, such as Laizhou seafood, barbecue, buffet and so on.

4. Longkou Fushan Hotel: Located in Fushan District, Longkou City, it is a three-star hotel. There are many restaurants in the hotel, which provide various delicacies, such as Fushan seafood, barbecue and buffet.

5. Longkou Nanshan Hotel: Located in Nanshan Scenic Area of Longkou City, it is a three-star hotel. There are many restaurants in the hotel, offering all kinds of delicious food, such as Nanshan seafood, barbecue, buffet and so on.

These are some delicious restaurants in Longkou. You can choose according to your own tastes and preferences.