I, too, loved the pure platforming levels floating in the air. Some of them were extremely difficult, but I enjoyed them all. The sense of satisfaction you get from those is missing in a lot of 3D games.
The camera also gave me problems. Not only on the amusement park behind those walls (which was the worst), but on the swinging boats on that level as well. Ugh!
I do agree, though, that the people and similar environments got old. They tried to vary it as much as they could within the tropical theme, and they did alright. Oh, and they still fit a lava level in there because... that... lady's dog was... really... hot....... Worst excuse for lava EVER.