Well you say don't go here but Playa D'en Bossa is right next door and easily walkable everyday.
My daughter loves the beach at Figuretas, It has two very shallow bays which are great for walking out in and seeing the fish. The rocks are great for catching crabs and little fish with nets!!!
Plus ibiza town is only 10 minutes walk away!
Playa D'en Bossa beach is only 5 minutes away anyway if you prefer a longer stretch of beach!