Hello sarath ,I will be happy to answer your travel queries🙂 and I'll do my best to clear out your queries from my experience .
* that's great to hear that you gonna have a road trip soon from 15 to 18 , conditions in Coorg are safe now and there are no flood conditions a such now
* Coorg is a great choice for road trip even from chennai ,it is famous for its fresh coffee plantations only found in South India, steep hills, countless streams ,rich flaura and fauna ,lush forests and breathtaking views. one must visit such unique places atleast once in lifetime *but still if you are looking for alternatives of Coorg in South India ,there are many hillstations like Kodaikanal,Ooty,Munnar,manglure, Chikmagalur and this list continues further *.prefer your own car with driver or self, instead of a cab I just checked checked online and found that the best deals compared to all others are available at tripoto itself ,do check out this link https://www.tripoto.com/coorg/tour-packages HAPPY TRAVELS