Perfect place to swim, snorkel, and sunbathe
The term "Costa Paradiso" applies to part of northern Sardinia made of rocky cliffs, caves, and pretty coves. It also shares its name with a complex of villas and homes which are pretty well-integrated into the surrounding landscape (something which other tourist destinations should learn!). One stand-out beach is "Li Cossi" and you can get there either walking from one of the parking lots in the complex or by boat. If you go walking, you need to go along a 300 meter path from which you can see some of Sardinia's crystal-clear waters and how they change their color with the sun.
When you get to the end of the path, the view of the beach from above, with the emerald waters and granite cliffs, is spectacular.