In the morning, visit the Kolukkumalai Tea Estate and try tea tasting. Take a hike in the afternoon to the Top Station for the stunning view of the Western Ghats. In the evening, visit the Tea Museum to learn about tea processing.
Enjoy an early morning boat safari in the Periyar Wildlife Sanctuary. Have lunch at a local restaurant and then visit the Spice Plantations to learn about spices and their usage. In the evening, take part in bamboo rafting in the Periyar River.
Spend the morning surfing and swimming in the Varkala Beach. Afterward, visit the Kappil Lake and take a boat ride. In the evening, visit the Janardhana Swamy Temple and watch the sunset from the cliff.
You can also go for a backwaters tour in Alleppey or visit the Athirapally waterfalls. For a side trip, you can drive to Kodaikanal in Tamil Nadu. To maximize your fun, try local cuisine like appam and stew, fish moilee, and puttu.