Answer:
Besides the fact that "visiter" is in the infinitive form, the principal difference is that "visiter" typically applies to a location that you might visit, whereas "rendre visite à" applies to a person or group of people that you might visit.
visiter = visit a location
rendre visite à = pay a visit to
Exemple (cas 1er): Tu me fais visiter la maison? / J'ai trop hâte de visiter le Louvre.
(You will show me around the house? / I so look forward to visiting the Louvre)
Exemple (cas 2d): Je dois rendre visite à mes grands-parents
(I have to pay a visit to my grandparents)
Explanation:
Hope this helps :)
