Having just been there I think this is quite a difficult choice (if 'choice' is the correct word to use for a vote of this kind) I think the Tiger enclosure is perfectly fine as it is. If it is Bears that win, I would like to see the Ravine area enlarged to include some of the wooded slope behind it to give a larger and more naturalistic area. The Chimps- I was originally in favour of this to be the winner but somehow that seems rather less important now having seen them. The Bears would give the Zoo a valuable new exhibit....but I'd still go for the Chimps as my personal preference.