Hi both resorts are in Cap Cans and in the same resort complex. Right next door to each other.
If you stay at AO do you have access to the Ziva side as well?
Yes you do.
Going to the side where there are families kind of defeats the purpose of staying at an AO resort. Unless for some reason there was some restaurant on the family side that wasn't on the AO side that you HAD to eat at.
Many resorts that have an AO section provide access to the other sections (family). It is the guest's choice to use those amenities but most enjoy having additional food or bar options. Of course, there are true stand alone AO resorts for those who absolutely do not want any kids around.