Hi Ashok,
You can visit Mahabalipuram, go fishing at Barracuda Bay, you can also go for a long drive on East Coast Road.
Here's a detailed article on Chennai and the best things to do there
- Enjoy the breath taking view and serene surroundings around Marina Beach.
- Thalankuppam Pier: An ideal place for the peace and silence lovers. Vist this place in the evenings to witness the golden rays of the sun paying hide and seek with the sparkling.
- Mahabalipuram Temples: Lean the history of Pallavas.
- Muttukadu: Its an ideal place for adventure junkies. It is known for range of water activities.
- Ubbalamadugu Falls: Enjoy the nature photography.
- Pulicat Lake: Witness a large number of migratory as well as local birds.
- MGM Dizee World : most entertaining rides and water slides, a fun-filled day in this amusement park is also among the best things to do in Chennai
Check out the following link https://www.funstay.in/ for more exiting things in Chennai.