Enchanted Gateway would have been solid. References the whole gateway to the west/gateway arch thing, incorporates "Enchanted" into the name of what is supposedly the chain's flagship park, is thematically agnostic (since the park doesn't seem to know what it wants to be when it grows up despite a ton of rethemes being imminently required), it evokes the idea of passing into a magical place separated from reality, and it allows the park to turn the existing, clever tagline "Gateway to Thrills" into a full branding/marketing system for the park (e.g. "Your Enchanted Gateway to Thrills!", "Your Enchanted Gateway to Family Fun!", "Your Enchanted Gateway to Halloween Frights!", etc.)