There are some really beautiful detailed descriptions in here;

She almost slipped from the mushy and slippery sticks and twigs beneath their feet.

I definitely would have slipped on this :)

A black umbrella next to a half-beaten up bench, the crowbars laying around, pressed up against the glass window as if pleading to escape the cold chill.

This adds to the creepy vibes you maintain throughout your entry, especially Dr. Utopia and the abandoned pool location.

I have only a small suggestion;

The pool was shallow and had a manikin with a yellow wig on and nails sticking out of its face floating face up.

The pool was shallow and had a manikin floating in it, with a yellow wig and nails sticking out of its face.

This just removes the repetition of the word face, as you had described the nails being in the face so you don't need to clarify the manikin as face up. Hope this makes sense.