Marina Beach Santhome Cathedral Chruch Museums. Also as a Option if you're traveling from Chennai a distance of around 60 kms away almost 1hr 45 mins journey( Early morning drive is amazing with scenic beauty everywhere) , You can visit Mahabalipuram ( Temple com Beach, Horse ride)
You Can Visit the Following Places 1. Marina Beach
2. Santhome Church
3. Besant Nagar Beach
4. Mahalakshmi Temple If you have more days, you can visit nearby places 1. Mahabalipuram - 60KM from Chennai ( It will also take a day to cover all the attractions) 2. ECR drive on the ECR , you can cover the following places if interested.
1. Crocodile and Snake Park
2. Muttukadu Boating
3. ISKON temple