1. Roman architecture and beautiful coastlines
2. The Republic of Venice
3. It has the narrowest street in the world.
4. It is hidden in the rocks.
5. It shows a beach has the highest water quality.
6. (i) It is well-known for its soothing properties and is perfect for calming sunburned skin.
(ii) the smell can linger on your skin for days
7. No, because there is no airport on the island of Krk.
9. The writer wants to emphasise that there is a lot of seafood on the island, and all tourists should try it.