Taking pictures at Seaworld with a Nikon D3100?

I'm going to Seaworld in a couple days and am bringing my Nikon D3100. But, I have a couple questions:

1) Should I bring my 18-55mm lens, or 55-200mm?
2) What do I do so that'll it'll focus on the animals, and not on the glass wall?

1. Why choose? Bring both The scenery is so divers you'll want to switch a few times.
2. Manual focus. Specially while shooting moving sharks you'll need to anticipate where they will be so waiting for auto focus to make up it's mind will be no good. Also using the 55-200 will give the least focus problems.

No flash. They will not allow it anyway but the reflection will kill any picture.

1. Take both - that's the point of having an interchangeable lens camera.
2. Use manual focus and a shallow depth of field so that foreground distractions will be out of focus.