I'd go with Cursed Tiki Temple, probably. It has a bit of everything, and I love the concept and the design.
I love Wumpa Islands, it's true that it's aimed mainly at platforming, but we should judge it by what it is and what it tries to deliver: a Crash homage in the format of a skylanders level. And as a huge fan of Crash 1, I absolutely love it.
Gryphon Park Observatory and Dragon Temple are also above the top.