Agree with the waterfalls and koi ponds! Yes, they're easy to find (hard to miss, really).
I *think* there may be a hotel tour, but I'm not sure about that.
They project the light image of Tinkerbell into the pool at night. I am not sure what nights, though, as we discovered last year that it didn't happen every night. I would guess it's weekend nights. If you have an upper level pool view room, it's very cool.
Be sure to have breakfast (or other meal, but breakfast is my favorite--good food, great prices, wonderful ambiance) at Steakhouse 55.
Many swear by Goofy's Kitchen, so I will mention it. They are supposed to have great character meals and a good dinner buffet. However, I personally don't care for it much (did the character breakfast only).
Next to Goofy's Kitchen, there is a fun car for photo ops. Also nearby is a little screening room where they show cartoons for the kids.