In the morning, explore the UNESCO World Heritage Site of Mahabalipuram, known for its rock-cut temples and impressive monuments. Start with the Shore Temple, built in the 8th century, followed by the Pancha Rathas and Krishna's Butterball. In the afternoon, visit the Mahabalipuram Beach and indulge in some water sports such as jet skiing or surfing. End the day with a visit to the Tiger Cave, a scenic spot for watching the sunset.
Head towards the southernmost tip of India, Kanyakumari, which is known for its breathtaking views of the sunrise and sunset over the ocean. Visit the Vivekananda Rock Memorial and the Thiruvalluvar Statue, located on a small island off the coast. In the afternoon, visit the Kanyakumari Beach and the Gandhi Memorial. End the day with a sunset view from the Sunset Point.
Explore the capital city of Kerala, Trivandrum, which is known for its rich cultural heritage. Start with a visit to the Padmanabhaswamy Temple, a famous Hindu temple dedicated to Lord Vishnu. In the afternoon, visit the Napier Museum and the adjacent Art Gallery, which has a collection of Kerala's traditional and contemporary art. End the day with a stroll through the Kanakakunnu Palace and its surrounding garden.
If you have time, consider visiting the Kovalam Beach in Trivandrum, which is famous for its crescent-shaped coastline and water sports activities. You can also plan a day trip to the nearby hill station of Ponmudi, known for its tea plantations and scenic views. Don't forget to try the local cuisine, such as fish curry and appam, which are popular dishes in Kerala.