Let's Go Fly a Kite is the song I believe you're referring to although there seems to be dispute as to the inspiration for the song. Look here for more info:
http://en.wikipedia.org/wiki/Let%27s_Go_Fly_a_Kite
Let's Go Fly a Kite
Written by: Richard M. Sherman and Robert B. Sherman
LYRICS:
Let's go fly a kite
Up to the highest height
Let's go fly a kite
And send it soaring
Up through the atmosphere
Up where the air is clear
Oh, let's go fly a kite
Let's go fly a kite!