A walk through an estate beats most waterfalls. Arabica picking runs about November to January and robusta about December to February or March. Book the walk through your homestay or an estate directly and check that it includes a tasting and processing demo.
Kodagu is reported to grow roughly a third of India's coffee, with arabica at higher elevations and robusta lower down. Estates often sit next to spice plantations, and many double as homestays.