Took my DD(4) & DNephew(6) this past August. They loved the WL. They were particularly impressed with the courtyard (read POOL - they always wanted to swim!!

)and lobby . My DN thought the slide was the greatest thing. He loved watching the Geyser.
Our lunch at Whispering Canyon was fun. Both kids enjoyed the Lincoln Logs in the restaurant lobby. The boat trip from WL to FW & Magic Kingdom is a nice ride too. Both kids enjoyed that. They even enjoyed hanging out in the Lobby.
We were also Flag Family - was that an awesome experience.

Everyone gets to raise different flags and you get wonderful pictures. You can see the courtyard and all below from the roof (my DD thought the pictures she took from here were 'COOL'

)
Oooooooooh! Don't forget to ask to sit in the front of the monorail. I think DH loved this more than the kids though
They quickly got hooked on the pin trading (check for some discounted pins at the local
Disney Store before you leave!) and the pressed penny machines that are all over the resorts and parks. Ask for a list of the pressed penny machine locations at the guest services desk. That way you'll know where to lead them to the pennies!! (and how much change to bring

) We brought rolls of pennies and quarters from home.
Those are just the highlights. Have fun - I'm sure your kids will enjoy the trip!!!
Colette