Kayaking or stand-up paddleboarding in Sri Lankan lagoons?

Yes, there are options in Negombo lagoon, Bentota river/lagoon area, and some spots near Galle and Unawatuna. You can paddle through mangroves and see birds and village life from the water. It's very peaceful compared to the ocean. Rentals are available through some guesthouses and small operators. Best early morning before wind picks up. Always wear a life jacket and go with someone who knows the area if you're not experienced with currents or tides.