Because the volcano is being building with water slides coming into and out of its infrastructure BUT So far many of the rest of the water slides in the part look to have the typical water park infrastructure of steel beams, support poles, and colorful fiberglass slide pieces. Construction is also highly visible from the freeway. Which does begs the question, will the freeway be highly visible from the water park?
Yes it's a little early to tell, but the water park is well into its vertical phase of construction and things are beginning to look complete.