You obviously wouldn’t plan a holiday around specifically a visit to Kochi (Cochin). Most likely when people are visiting this part of the world it is for a trip along the backwaters (see Kerala’s Backwaters for tips) , for the beaches or to the Western Ghats.
But . . . if you are in this part of the world, Fort Cochin is well worth the visit. It has a heap of history, some nice views across the various waterways and the whole area of Fort Cochin itself (the northern part of the peninsular vs the rest of Cochin which is gash) is actually quite pleasant to walk around. Think huge trees, pretty alleyways, and largely traffic free spots
Top tip – stay at the Old Harbour Hotel. Perfect location at the entrance to the alleyways, a heritage hotel with over 300 years or history, and just beautiful grounds