I’ve been to Gyeongju World (경주월드) twice, once on a sunny day...
I’ve been to Gyeongju World (경주월드) twice, once on a sunny day and another time on a rainy day. It’s a quick trip from Busan and I had a blast both times. It’s a nice alternative if one doesn’t want to go all the up to Seoul for Everland and Lotte World.
There is a decent collection of carnival rides and attractions at Gyeongju World. Something to keep in mind is that three of the coasters opened over 20 years ago -one is nearly 30 years old!-so they’re pretty tame. None of them will be running on a rainy day though, just so you know.
Their water park, California Beach (캘리포니아비치) is not as good as Everland’s Caribbean Bay or the Gimhae Lotte Water Park (김해롯데워터파크), so steer clear.