Marina Beach is one of the longest urban beaches in the world and is a popular spot for morning walks and jogging. The beach is lined with street food vendors and small shops that offer snacks and souvenirs. In the afternoon, explore the nearby Fort St George, which is the oldest surviving British fort in India. The fort has a museum that displays British-era uniforms, weapons, and paintings. In the evening, visit the Kapaleeswarar Temple, which is one of the oldest temples in Chennai and is dedicated to Lord Shiva. The temple has a beautiful gopuram (tower) and a tank where visitors can take a dip.
Take a day trip to Mahabalipuram, a UNESCO World Heritage Site that is famous for its rock-cut temples and sculptures. The Shore Temple is the most famous attraction in Mahabalipuram and is a beautiful example of Dravidian architecture. The temple is located on the beach and offers stunning views of the Bay of Bengal. In the afternoon, explore the Five Rathas, which are five rock-cut temples that are shaped like chariots. Each ratha is dedicated to a different deity and is carved with intricate details. In the evening, visit the Krishna's Butterball, which is a giant boulder that balances precariously on a slope and is a popular spot for photography.
If you have time, consider visiting the Government Museum, which has a large collection of South Indian bronzes and sculptures. For a unique experience, take a heritage walk in Georgetown, which is the oldest part of Chennai and has many colonial-era buildings. For a side trip, visit the Pulicat Lake Bird Sanctuary, which is a natural habitat for migratory birds. To maximize your fun, try some of the local street food, such as dosa, vada, and filter coffee. Finally, don't forget to shop for souvenirs at the T Nagar Market, which is one of the busiest shopping districts in India.