The Crystal Palace has several areas that can be freely used by the visitors.
Guest quarters - The visitors are all given rooms, very comfortably furnished, with walls and floors made of wood (despite the castle's appearance) and normally (though ornately) made furniture.
The pools - In the glasslike floors of this chamber are several pools, each resembling natural ponds, some equipped for swimming or wading, some obviously reproducing hot springs.
The Hall of Statues - Through the art gallery of the palace lies the Hall of the Fallen. In this, they will find statues, reverently made, of many of those fallen in the battles over the years, sculpted from white marble, the unmelting ice, or any other apropriate non-metallic substance according to the person represented.
There are other areas that may be added, but I wanted to put up these in the interest of free play while I'm not on.