I hope you enjoy your trip to Hawaii! Hawaii is of course domestic; you will have the same privelege of unlimited data that every other Sprint customer enjoys! What area do you live in Upstate NY? Your plan includes roaming (to an extent) and data charges are only applied with your plan if you are roaming internationally.
Sprint Social Care
Check out a fun infographic that teaches you how to increase storage, enhance security, improve battery life and clean your device.