If you want to experience another side of Sri Lanka - an area much less explored, give Ceylon Soul a go. It's worth checking out their Farm 2 Table experience where you get to be not only a part of cooking a Sri Lankan meal from scratch, but you also get to pick the vegetables from the farm. They also have other experiences like mask painting and walks around the Galle Fort.
The Authentic affair Farm to Table with Shehan de Silva
One of the things you should do in Sri Lanka, Farm to table with sk de silva