Hyatt Ziva Cancun tops the family-only list—it's built specifically so grandparents don't feel out of place while kids get serious attention via one of the Caribbean's best kids clubs. If you want maximum resort sprawl without the family-only restriction, Moon Palace delivers the goods: FlowRider, on-site water park, 14 restaurants, and hydro-spa jacuzzis in every room make it easy for multi-gen groups to split up and reconvene. Both are all-inclusive, so no hidden meal costs. Seadust works if you want solid programming minus the brand-name premium.