Hey kasturi, Some of the best places to visit during rainy season are goa, Lonavala, coorg, Andaman & nicobar, where nature resides in a very beautiful way.
Happy traveling
If its rain and nature that you want...Make it to Chikmagalur, there one resort called Eagle eye resort located at the exact center of a mountain, the view from there is amazing... Lush green Western Ghats... From there you can go towards Coorg or towards Agumbae according to your wish... While both are good locations...