Lynn:
Thanks for your question from across the pond!
Port Orleans offers many activities for children centered around Ol' Man Island, a point in the middle of the resort that houses its pools, a playground and even catch & release fishing with cane poles. Its main attraction, though, that my kids love, is the ferry that whisks you away to Downtown Disney. It's what gives this resort a leg up, in my opinion, over the other Moderate resorts.
As for the Kids Programs, I can understand the confusion.
Disney recently announced that they would accept 3-year-olds at their children's activities centers. I'm sure that printed materials may be out of date but the website it up to date.
Hoping you'll come to visit!
Whitney