Should I also hit Rama Krishna Beach or Visakha Museum after the Submarine Museum?

I’m planning to drop by the INS Kursura Submarine Museum in Visakhapatnam, and I’ve heard the entry is free and it’s open all day. The place is right next to Rama Krishna Beach, only about a kilometre away, and the Visakha Museum is just 2 km out. I’m on a tight budget and want to make the most of a single day. Would it make sense to add either of those spots to my visit, or is it better to focus solely on the submarine museum?