Need help to plan my 12 nights Monsoon trip to Kerala.

Hello everyone,

I will be travelling with my wife and son (10 years). Will reach Ernakulam early morning at 01:40 on 9th June. Will catch Trivandrum Rajdhani on 21st June from Trivandrum to Delhi. I have train tickets from Ernakulam to Varkala on 14th June at 06:25 hrs. (Just in case)

Would like to visit Munnar, Thekkady, kochi, backwater trip from one point to another(boat stay), kumarkom (stay at any lake resort), Lastly, Varkala, would like to stay at least 5 nights there and visit Kanyakumari on a day trip.

I have a rough budget of Rs. 55,000/- for hotel, food and transport.

Kindly help me with your valuable advise/suggestions to plan my Itinerary.

Many thanks.