If you can go to Hawaii, OBVIOUSLY it will not even be remotely close. It's just a very tropical, natural, beachy vibe compared to Korean cities busy, dense vibe. That's why it gets the nickname. Jeju is also, IMO, expensive and a lot of work - lots of driving around because the island is so big. Now, if you wanna go there and just SIT at a beach and a resort or an AirBnB in the middle of nowhere - perfect. But again, the beaches are Korean beaches. Nothing REMOTELY CLOSE to real Hawaii.