Check section 1 ("Recent Updates") and section 2 ("Warnings and Recommendation") of the Travel Report. It is generally safe to travel if there is no warning.
Check section 8 ("Local Laws and Customs") for information about documents required for a wedding in Cuba.
Consult Section 9 ("Local Travel and Currency") to answer the questions concerning vehicle rental and currency.
It is best to go over the Travel Report with your clients to ensure they are well prepared for their trip.