Day 1: Arrive in Chennai, visit Marina Beach and Kapaleeshwarar Temple. Day 2: Explore Mahabalipuram and return. Day 3: Visit Fort St. George and St. Mary's Basilica. Day 4: Travel to Mahabalipuram and return. Day 5: Explore Guindy National Park and San Thome Cathedral. Day 6: Visit Valluvar Kottam and depart. Day 7: Depart from Chennai.