"Visiter" means to visit a place (city, monument, country)
Je vais visiter Toulouse cet été = I'm going to visit Toulouse this Summer.
Il a déjà visité Notre Dame de Paris = He has already visited Notre Dame of Paris.
If you want to express the idea of "to visit a person" then you need to use the French expression: "Rendre visite à".
Je vais rendre visite à mes parents ce week-end = I am going to visit my parents this weekend.