Popular wildlife boat ride (morning and afternoon slots available; afternoon cruises often run 2:00pm–5:00pm) to spot elephants, deer and birds along the shoreline.
Board a traditional kettuvallam (houseboat) around midday for a 1-night cruise through canals, lagoons and paddy fields; check-in typically 12:00–2:00pm and cruise through afternoon into evening.
Visit the 16th-century Mattancherry Palace (open ~9:30am–5:00pm) and stroll Jew Town lanes with antiques and spice shops; Paradesa Synagogue visits usually 10:00am–5:00pm (closed Saturdays).
Reach Bangalore in the evening; if you want a celebratory final meal try Vidyarthi Bhavan (if open) or local favourite Maharaja Bhog for a Rajasthani/Indian feast.