It seems as if all these beaches are our favorites, but Cala Llonga is one of the best for kids.
Its a horseshoe shaped beach with two major resorts in both sides.
Several restaurants and pubs in walking distance, plenty of self-catering apartments and some big all-inclusive hotels which have a lot of great family friendly-activities including kids clubs, shows, etc Probably like the Iberostar hotels we stayed at in the Dominican Republic. The kids and I would love to stay there one day.
We probably have a connection here as this was the first location in Ibiza we stayed like 13 years ago!