Do visit the sea museum there, kids will enjoy and GRT grand bay is a great stunning property if you can do visit them for a soothing dinner experience.
Here are some dos and don'ts and places to visit in Mahabalipuram: Dos: Carry comfortable footwear and clothing suitable for the warm and humid weather.
Keep sunscreen and insect repellent handy.
Carry enough water and snacks for the kids.
Respect the local culture and traditions.
Bargain while shopping in the local markets.
Hire a guide to explore the historical monuments.
Don'ts: Do not litter in public places.
Do not wear revealing clothes in religious places.
Do not touch or disturb the historical monuments.
Do not trust strangers and take care of your belongings.
Do not swim in the sea during high tide.
Places to visit: Shore Temple
Pancha Rathas
Mahabalipuram Beach
Arjuna's Penance
Krishna's Butterball
Tiger's Cave
Crocodile Bank
DakshinaChitra
I hope this helps and you have a great trip!