Chennai is famous for its Marina Beach 2nd largest urban beach of the world. Although there are number of spots to be covered in nd around Chennai. Government Museum Chennai
Fort St. George Museum
Chennai Snake Park Kapaaleshwar temple You can also visit Mahabalipuram Near Chennai
Here's is the rundown of Must Visit Places In Tamil Nadu During Christmas and New Year:
1. San Thome Basilica, Chennai.
2. St. Andrew's Church (The Kirk), Chennai.
3. Armenian Church.
4. St. George's Cathedral.
5. St. Teresa's Church.
6. St. Thomas Mount National Shrine.
7. Marina Beach Chennai.
December is a blend of rain and start of chill weather in Chennai. It is called as Marghazhi month where you will see lot of music season, spiritual discourses and early temple visit days. One such ideal time to visit. Here are some spots to visit
Within the city
Beasant nagar beach
Planaterium. Around the city
ECR road drive plus beaches
Kanchipuram tada falls
and VGP Since you are planning December visit, don't miss out on early morning temple visits, try to attend one music concert, taste best Street food in the beach, Mada street and Tnagar market.