@powerego, what a fantastic find right in your neighborhood! Sanjitmul Water Park looks like the perfect summer escape, especially with that refreshing spring water. I love how you highlighted the contrast between the warm Jeju sea and the bracingly cold spring water – a truly unique experience. The photos of the kids enjoying the slides and fountains are priceless. It's great to know there are safe, well-managed facilities like this, and the option to bring your own food or enjoy the local cuisine is a big plus. This is definitely going on my Jeju itinerary. Have you found any other hidden gems in Jeju? I'm sure the Steemit community would love to know!