Sure, I'd be happy to help you plan your 3-day itinerary in Vizag! Here's a suggested plan:

Day 1:

• Start your day with a visit to the Kailasagiri Hill Park. This park offers stunning views of the city and the Bay of Bengal. You can take a cable car ride to the top of the hill for an even better view.
• Next, head to the Submarine Museum. This museum is located inside a decommissioned submarine and offers a unique glimpse into the life of submariners.
• After that, visit the Ramakrishna Beach. This beach is one of the most popular tourist spots in Vizag and is perfect for a relaxing stroll or a dip in the sea.
• In the evening, head to the Rushikonda Beach. This beach is known for its golden sand and clear waters. You can also indulge in some water sports activities like jet skiing, parasailing, and banana boat rides.

Day 2:

• Start your day with a visit to the Borra Caves. These caves are located about 90 km from Vizag and are famous for their stalactites and stalagmites formations.
• After that, head to the Araku Valley. This valley is located about 120 km from Vizag and is known for its scenic beauty and coffee plantations. You can take a train ride through the valley to enjoy the beautiful views.
• In the evening, return to Vizag and visit the Dolphin's Nose. This rock formation offers stunning views of the sea and the surrounding hills.

Day 3:

• Start your day with a visit to the Simhachalam Temple. This temple is dedicated to Lord Narasimha and is one of the most important pilgrimage sites in Vizag.
• Next, head to the Indira Gandhi Zoological Park. This zoo is home to a wide variety of animals and birds, including tigers, lions, elephants, and peacocks.
• After that, visit the Visakha Museum. This museum showcases the history and culture of Vizag through various exhibits and artifacts.
• In the evening, head to the Yarada Beach. This beach is located about 15 km from Vizag and is known for its serene atmosphere and beautiful sunset views.

I hope this itinerary helps you plan your trip to Vizag!