if you fancy a trip to sosua there is a place called sosua ocean village with pools, restaurant and a kiddie area with slides and various toys. it also has an onsite spa so you can relax while hubby gets to care for the kids.
further west, in POP, there is ocean world, a small park with various attractions like tigers, birds and animal shows. they also have slides. check for their offers, sometimes a deal is to be had. entry includes shows and a lunch, attractions like swimming with dolphins cost extra.