Walk the historic Fort Kochi shoreline to see iconic Chinese fishing nets and colonial-era churches; St. Francis Church is usually open 9:00am–5:00pm. This gives an immediate sense of Kerala's layered history.
Visit the Dutch/Mattancherry Palace (typically open ~10:00am–5:00pm) and stroll Jew Town's antique shops; the Paradesi Synagogue has restricted entry hours—check local timings before visiting.
Visit Eravikulam NP for views of Anamudi and (seasonally) Nilgiri tahr; park typically opens early (around 7:00am) — book tickets in advance where possible.
Board a traditional Keralan houseboat for an afternoon-to-next-day cruise of the Vembanad backwaters — standard check-in is around 12:00–1:30pm; confirm boarding time with operator.
Disembark from the houseboat after breakfast; many houseboats arrive back at the jetty by mid-morning — confirm exact disembark time with the operator.
Return to Mattancherry for last-minute shopping in Jew Town and, if open, visit the Paradesi Synagogue (confirm opening hours; some restrictions apply on certain days).
Check out and depart for Cochin International Airport — allow 1.5–2 hours for road transfer and international/domestic check-in depending on your flight.