With toddlers this young, you need calm water and zero overwhelm. Aulani and Grand Wailea both nail that—one's a Disney property engineered for your exact age range with gentler attractions and character time without the park chaos; the other's a full water-playground resort that still feels manageable because the slides and pools are built into a 5-star structure, not a carnival. Skip Waikiki's crowd and noise. If you want Kauai's slower vibe, the Grand Hyatt's saltwater lagoon and actual kids' club beat the Hilton properties' broader appeal.