There are many nice beaches in Chennai, but the most popular one is the Marina which is bang inside the city.
You could just walk or jog, sit peacefully in the sand and enjoy the breeze, or be more daring and face the lashing waves which could get more intense with time. Best experiences can be had by visiting either in the morning or evening, when the tyrannical sun is not in its peak.
It's not uncommon to see people indulging in games like football, frisbee, cricket, etc. with the loose sand offering a different kind of turf than a normal playground. Kids and adults alike can enjoy a horse ride as well. You could also check out the variety of street food that is on the menu.
The Beach road along the Marina is dotted with heritage buildings, landmark monuments and architecturally aesthetic memorials of departed political leaders,