Ooty.
This place is so serene and natural.
You can visit the place where there are huge eucalyptus trees and the must try is the chocolates that you get from that place .
Ooty and munnar both are best destinations.,ooty,tamilnadu _ is 3days enough to cover all touristspots,train journey is awesome, highest peak nilagirihills,coffeeplant,safari, scenaries, etc.,..
munnar kerala_its also a good climate ,there are many places in munnar 4routes separated ,trekking is famous in munnar,cinemashootspots,junglesafari,etc..,both are best hillstations in southindia ,I suggest short time means go for ooty,more time to spent go for munnar.
Any day munnar! I've been to both places.. but after seeing munnar you just can't like anything else!!
However not sure if it's safe to visit munnar post the flood conditions..