Morning: Start your morning off early to beat the heat and head to Marina Beach, the second-longest urban beach in the world. Take a stroll along the promenade and watch the sunrise over the Bay of Bengal.
Afternoon: Once you've got your fill of sea and sand, head to the nearby Santhome Basilica, one of the most prominent Catholic churches in the city.
Evening: For dinner, head over to Mylapore, one of Chennai's oldest neighborhoods, and sample some delicious South Indian food at any of the local restaurants.