Final answer:
The correct verb form is 'visites'
Step-by-step explanation:
The correct verb form to complete the sentence is visites. The subject, 'Les', is the pronoun 'you' in the plural form. In Spanish, when giving a recommendation or suggestion to 'you all,' the verb form should be in the second person plural, which is 'visites' in this case.
Learn more about Spanish verb conjugation