Hi Arnab, If you want to checkout both mountains and beaches Mysore, Coorg, Mangalore, Udupi, Gokarna this route is better. In first route there will be no beach. Keep travelling!
Dear Arnab, The area which U have mentioned will be raining during December. If you are a beach lover go for 2nd option or if you are wildlife/forest lover then go for 1st option...