Reach Ernakulam junction or Ernakulam Town; take a prepaid taxi/ride to Fort Kochi and check into a budget romantic homestay or heritage hotel (small room, big character).
Explore historical murals and antique collections; palace open ~9:00am–5:00pm, synagogue typically open mid-morning to evening (check local timings on the day).
Most houseboats check in around noon; a private standard houseboat typically includes lunch, dinner and breakfast — ideal romantic experience cruising canals and paddy fields.