Hi Avinash, I suggest you to visit Madikeri and Jog falls. I suggest you to stay there for a night. Plan to stay on a tree house in Coorg enjoying the Camp fire and food there. Last day to Munnar
Avinash,
Try the Wayanad-Munnar Road Trip. It's near to Mysore and can be completed well within 3 days.
Or
Kodaikanal-Ooty Trail is also a great option.