Might want to google it. I've grown up going to Myrtle and I'm not sure what kind of attractions you are talking about. Myrtle Beach is heavy on dinner shows, and a few small attractions like an Aquarium, Ripley's believe it or not and some haunted houses. There is one or two carnival type ammusement parks, but that is about it. Myrtle Beach has an amazing number of places to eat and shop and play mini-golf, but I would not call it an attraction heavy destination.
Also, not sure what the hours are like in April for all those things, as that is off-season. Places lile Boardwalk and Broadway will definately keep you busy for a couple nights and those places have lots of little attractions to visit.
Have fun. I'm hoping this April will be nice and warm. Will be in Hilton Head, myself.