Think glorified zoo, really. Only Disney-fied, so way more fun. Some highlights:
Calvin participated in the Wilderness Explorers activity, which had us hiking all over the park in search of "rangers" so he could earn "badges" by learning some neat ecology facts. Two things. First, we were disappointed to learn that the badges were just stickers. Second, depending on your age and knowledge level (Calvin is at the top of the range), this will be just a hunt for stickers, not an educational activity. That's okay, it was fun.
Meals! We scarfed down breakfast at the Rainforest Cafe, and enjoyed a character lunch at the Tusker House that was delicious, but nothing, and I mean nothing compared to dinner at Tiffins. That was to die for.
And Pandora was a delight to behold, especially after dark.