I'd definitely like more decorations, for a theme park just trees, plants and benches is a bit annoying. However the amount of rides on launch, I can't complain.
I think they can easily amalgamate Mt Splashmore, Duff Gardens and Itchy and Scratchy Land into KrustyLand.
For example:
http://simpsonsscreenshots.com/wp-content/uploads/2011/06/vlcsnap-2011-06-27-00h38m32s236.png
http://2.bp.blogspot.com/-PA9BmnbrU04/TfriGjhDL4I/AAAAAAAAAZ4/PYDvG6LEXL8/s320/is_50.jpg
http://images4.wikia.nocookie.net/__cb20101217173727/lossimpson/es/images/7/77/Itchy%26ScratchyLand_Map.png
http://farm7.static.flickr.com/6143/6026422927_ba5ef4ec8e.jpg
http://images2.wikia.nocookie.net/__cb20121021161542/simpsons/images/c/c0/Duff_Garden_2.jpg
http://images2.wikia.nocookie.net/__cb20121021161553/simpsons/images/e/e3/Duff_Garden.jpg
And Surly as character. I even photoshopped him into another thread an no-one noticed, he looked that at home!
http://31.media.tumblr.com/tumblr_m2c7oiMzVE1qcy3lho1_500.png
http://i43.tinypic.com/14wznde.jpg
Apologies for such a big post.