So many to chose from!
These are my favorites so far:
The fountain at Epcot - I could watch that for hours if my DH would let me. Also, the jumping fountains at the Imagination pavillion.
I love watching the castle change colors and I could sit in view of the TOT and listen to the screams for hours as well.
I hope to have some new favorite spots when I go "home" to SSR in Dec!
D4D