In the morning, head to the Lighthouse Beach in Kovalam for some sunbathing and beach activities like volleyball and frisbee. At afternoon, you can stroll along the beach and enjoy the beautiful view of the Arabian Sea. In the evening, head to one of the many beach shacks or bars and enjoy a few drinks with your friends while listening to live music.
Start your day with a backwater cruise in Alleppey, which is known as the Venice of the East. You can rent a houseboat and enjoy the scenic view of the backwaters while having lunch onboard. At night, head to the Fort Kochi area in Kochi which is famous for its nightlife. You can visit some of the popular bars like The Bar at Brunton Boatyard or The Terrace Grill at Eighth Bastion and enjoy the party vibe.
Visit Athirapally Waterfalls in the morning, which is the largest waterfall in Kerala. You can take a dip in the waterfall or go for a short trek in the nearby forest area. In the afternoon, head to a spa resort like Kairali Ayurvedic Health Village and enjoy a relaxing spa treatment. In the evening, head back to Kochi for a farewell dinner at a seafood restaurant like The Oceanos Restaurant.
Make sure to try out some of the local Kerala cuisine like Karimeen Pollichathu (Pearl Spot Fish), Appam and Stew, and Malabar Parotta. You can also consider side trips like a visit to the Periyar Wildlife Sanctuary or a trek to the Meesapulimala Peak. To maximize your fun, try out some adventure activities like parasailing, kayaking, and scuba diving. Lastly, don't forget to take some Ayurvedic medicines as Kerala is famous for its Ayurvedic treatment.