The Costa Blanca is made up by a number of small towns with pleasant beaches. Some towns are bigger than others (Denia is one of the larger ones) and some are package holiday monstrosities (heard of Benidorm?). Gandia is one of the beaches that is more popular with the Spanish than foreign tourists, so it must have something going for it. Have a look at these Costa Blanca Beaches for more details of beaches in the area.
Compare prices on Gandia Hotels on Kayak