We took the ferry over to Formentera one afternoon. It cost about 40 euro round trip, and it was worth it to get a chance to explore another island. The day we went was the warmest of our whole trip. We were able to put our feet in the water and hang out on the beaches. Additionally, the island has a long peninsula of beach that was really beautiful to walk along. We finished out the day with some wine and snacks from the cafe just by the docks.