Here are some more picks of the playground:
As you enter...

That is a giant, deep, foamy hole...

Front view of the castle:

Back view:

The bowl swing:


The sand pit (with a fountain nearby):

The spinny thing:

There's instruments too.
These are giant metal tubes you can hit with gaint mallets to make really nice chords:

There's also a xylophone and some plastic tube drums.