I ended up to spend 2 fabulous days in Kochi:
Saturday
07:00 - arrival in COK
08:30 - arrival in Fort Cochi at the homestay I booked online. I guess average, but had good breakfast.
10:00 - left for Cherai beach on Wypin island.
11:20 - arrival on beach after 15 min walk + 10 min ferry + 45 min local bus + 10 min tuk-tuk. The beach might not be comparable with Thailand, but it was GREAT! Fine sandy beach >10 meter wide, warm water, good security. Highlight of the day was seeing dolphins while having a beer on a local terrace. It was exactly the day I wanted.
17:30 - back to Fort Cochi
18:00 - fresh fish from seashore market cooked at one of the local restarants - absolutely divine!
20:30 - early sleep
Sunday I went on a backwater tour by boat, a very nice way to spend a quiet day among locals. I was not keen on returnng to the beach, so was a really nice day.
Monday morning - flight back to BLR, and now back to work