A good decision to keep it rocky
Altea is not a perfect place for beach purists. It’s beaches are covered in both sand and rocks. But, this had its advantage, as the beach isn’t overly crowded. You can find some peace, even in August.
I think it was a great decision to maintain the beaches of Altea in their natural state, with rocks. They were talking about brining sand from other beaches, but it would have been a huge mistake. Just look at the two closest cities: Benidorm and Calpe. Those beaches are more stressful than relaxing.
Cap Negret beach is next to La Olla beach and Mascarat beach. Those three are my favorite beaches. It’s an open beach, about 2 kilometers long and goes about 10 meters in from the shores. The water is normally clean and there aren’t too many people. The only inconvenience is that if you’re staying in Altea, you’ll have to take your car to get to the beach. If you want to spend the whole day there, there are food and beverage stands on the beach with good-enough offerings. The specialty there is paella (in all of Altea you can find great paella).