Need help narrowing down attractions!

I’m visiting for the first time in July and currently have the below on my list for when in Seoul:

* Sea Life Aquarium OR Aqua Planet

* Seoul Botanic Garden

* Théâtre des Lumières

* Gwangmyeong Cave

* Lotte Art Museum

* Gahoe Museum

* Presseum

Are any of these not worth seeing, and, if so, would you recommend something else in its place?

Note: This is just my museum/attraction list. I’ll absolutely be checking out multiple districts and a couple national parks in addition to Deoksugung Palace and Hwaseong Fortress. 🙂