Dear Freind, When we visited Vizag we had a nice lunch at Kamath. Kamath has a chain of vegetarian restaurants. These nice clean restaurants offer meals in affordable prices. These chain is very popular and are generally crowded. there is a non - vegetarian wing of kamath too and it is not far from the main beach area. Apart from that we had a nice sea food dinner at our Hotel Palm beach resort but it is a costly affair. If you are going to stay at Rushikonda than you will have to depend on the restaurant of the hotel you are going to stay. you can try out some outlets infront of the beach also near YMCA. They are cheap but the standard can vary.
I would suggest you to try at Hotel Daspalla for a really good Andhra Food. Try the Veg and the Non Veg Restaurant. It is areally good one. Then you have Hotel Dolphin. Both of them serve good food at reasonable rates.
If u like to enjoy ur food with sea Pls visit Saipriya Beach Resort in Rishikonda. But if you are staying in Vigaz city then only u should come for lunch here. If u are staying there only then u should have ur dinner there because it is 25 kms away from the city. But the ambience with sea and open garden bar cum Restaurant is nice with lots of sea foods.