You don't mention how many kids you have, but if you're looking to dump them and go have a nice adult evening, the Neverland club is great. We dumped Emily there, went to Flying Fish for dinner and wandered around Boardwalk and Epcot for a few adult-oriented hours, then went back to get her.... and she refused to leave. She had a great time and it wasn't that expensive (it's $10/hour/kid now).
Don't forget a meal at the Kona, particularly breakfast. Everything that's been said so far about 'Ohana is correct, don't miss it.
I'm insanely jealous.
Good luck and have fun!
Kevin