need recommendations regards places to roam and party..

hello, I'm new to chennai and to South India actually. I need some recommendations regarding site seeing and places to chill in chennai (Main City as well as ECR). I also was wondering what's the partying or clubbing scene over here. is it possible or no? and what is the alcohol scene like here? are there shops or do i need to go to a bar.. I'm hoping to enjoy my days here in Chennai. Also would love local cuisine recommendations ;).