The Aqua Coaster and Honu Slides are open for EPA, which are in River Village. So the area should be open to find seating. The best shade spot in that area is a small covered structure that’s not shown on the map, but here I circled in red where it’s located:
Here is what it looks like:
It has 8 loungers, a concrete floor, and a fan. Image from an identical one at another place in the park:
