Kerala is definitely stunning during the monsoons as the rain washes the state clean and the greenery is at its brightest. But this also means that the roads will be wet and slippery and thunderstorms might mean you will have to take breaks more frequently. If you are up for the challenge, you can read about this traveller's experience on a road trip in Kerala: https://www.tripoto.com/trip/best-bike-road-trips-in-kerala
I hope you have made your trip. It would be helpful for travellers if you share the travel details:
1.Route
2.Transportation
3.Weather
4.Budget
5.Places to see
6.Tips for travellers etc.
Happy travelling.