Yes,depends where you are staying as to what is convenient,but:
Out of San Antonio,Es Vedra cruise,various beaches,like Calla Bassa etc,lots of evening stuff,not too boozy!
Between Ibiza town,Cala Llonga,Santa Eularia and Es Cana,daytimes.
Quick fly across the harbour from Ibiza town to a couple of mins walk to Talamanca beach
If in Figueretas or Playa den Bossa, couple of boats in the morning to Formentera (also faster boats from Ibiza town)
loads more, bon voyage !!