We just got back from N Myrtle beach and we checked out several campgrounds while there. You already mentioned 3 of them but we also liked Myrtle Beach Travel Park. I've also read good things about Myrtle Beach State Park. I rode through Apache Campground and it wasn't for me.
We got a trip planned later this summer to Ocean Lakes. Can't wait!
2012 F150 SCrew EcoBoost
2013 Salem 27RKSS