Grand Wailea and Grand Hyatt Kauai are the strongest multi-gen plays here. Grand Wailea wins on pure water-park energy—nine connected pools and waterslides keep kids engaged for hours while grandparents actually relax. Grand Hyatt Kauai balances that (fantasy pool, snorkel lagoon) with cultural programming that works across age groups and the built-in structure of a real kids' club. If your crew spans toddlers to grandparents and needs to keep everyone occupied without splitting up, these two nail the overlap. Budget is steep, but these resorts function as self-contained destinations—you won't hemorrhage money on off-property activities just to keep the peace.