"Where are you visiting?"
"Where will you be visiting?"
2 Answers
I am going to visit Curacao in September. Voy a visitar Curazao en septiembre. (smiley)
¿Dónde vas a visitar? Where are you going to visit?
¿Dónde visitarás? Where will you visit?
But often the verb "ir" is used informally, just likw we say in English: Where are you going?"