I live 50 miles from PCB and I dont go to the beach that often, they do have a water park (shipwrick island) pricey, gulf world, have not been in years, they have a couple of boat rides, a pirate ship my kids loved, and a speed boat that holds like 30 people or so it was yellow but forget the name (you could google, it was worth the price they make sure to get by any dolphens and saw some jelly fish and the pick up some crab traps...of course paraselling and renting water craft again pricey, helocoper rides, again pricey.See a patern. I went last year and stayed at Splash, so we mainly just played in the swimming pools. Their realy is not that much family orented stuff to do in PC at least that wont cost a arm and a leg. I went in Aug and the sea weed was nasty maybe July it wont be to bad.
If your kids are like mine though the pool and building sand casels will keep thim happy for a day or two