Located west of San Antonio Bay and best accessed by a 15 minute ferry ride from San Antonio, Cala Bassa is one of the most popular beaches in Ibiza. Shaped like a sandy hook in which the azure waters of the Mediterranean shine, you'll have all the amenities (food options, showering facilities, etc.) that have been built in response to the crowds that swarm here on the weekends. For the more adventurous spirit, take the short walk to the old watchtower that looks out over the island of Conejera. Otherwise, rent a jet ski or banana boat for fun above the glistening surf or bring a snorkel for a chance to see beneath.
Note:There are a few more expensive restaurants near the beach and a few bars on the beach if you're looking to indulge during a day of sun.