The Emerald Coast's 70 km (43 miles) of rugged cliffs and caves alternate with quiet resorts offering sandy beaches.
The coastline is home only to rugged waters and sandy beaches. 
mnli hypothesis: The coastline is home only to rugged waters and sandy beaches.  premise: The Emerald Coast's 70 km (43 miles) of rugged cliffs and caves alternate with quiet resorts offering sandy beaches.