This page argues that Saturn's density tells scientists that it has a liquid metal core with maybe some rocky chunks:
The core region of Saturn may never be directly observed. Neither has the Earth’s. Despite that, scientists are fairly certain that, while Saturn has a core, it is not a solid mass of rock or metal, but a liquid metallic mixture similar to all of the gas giants.
And this QA implies that that core would be completely covered by solid diamonds.
So, would there be anything solid to land on from the air inside Saturn, and what would that be?