Some we have already heard about, such as the Pirate Adventure at the BC. But this article has a nice round-up of other activities, including Mermaid swimming lessons, Art classes and Fishing.
As an aside, why is the Disney Parks Blog such a cumbersome site? If you try to find something on it, like about the buses to the water parks, the search is useless, with some results coming up which are years old. You really have to spot something on the front page or forget it!