All three picks are all-inclusive resorts in Cancun that handle multi-gen groups well, but they split on approach. Moon Palace is the sprawling playground—water park, FlowRider, 14 restaurants—built to keep every age occupied and parents' hands full in the best way. Hyatt Ziva takes the opposite angle: family-only property on its own peninsula with three beaches and a top-tier kids club, so you're not wading through spring breakers to get anywhere. Seadust sits between them with solid programming at a smaller footprint. All-inclusive is the only smart move here with mixed ages; your food, drinks, and entertainment are locked in.