Just now I'm surprised the grand opening theme song Medley is from the Night at the Museum 2 - Fly with me.

Though I think the parade is a bit short, the choice of songs is very impressive, and a nice touch..
The song is great, I like it!

And here I just do a little search about the Flight of fantasy parade songs with youtube links (unofficial), that I can sing along next time . There may have some mistakes in the lyrics (i don't know if it's "XXXless blue") and my translations.

Flight of fantasy (Medley Fly with me, Zip-A-Dee-Doo-Dah, Mickey Mouse Club March) Lyrics translations in bracket

這美滿慶典我共你 齋飛起飛起飛起 滿空稀奇 (In this happy celebration, let's fly and fly, it's full of extraordinary in the sky)
我會帶你去飛躍萬里 齋飛起飛起飛起 滿載了驚喜
(You and me will fly over thousands of miles, let's fly and fly, fully loaded with surprises)
跟清風擁抱 天空中裡起舞 (embrance the breeze, dance in the wind)
誰飛起飛起 隨想象去歷奇 (We fly and fly, adventure in imagination)

Zip-a-dee-doo-dah, zip-a-dee-ay
My, oh my what a wonderful day!
Plenty of sunshine heading my way
Zip-a-dee-doo-dah, zip-a-dee-ay

Who's the leader of the club
That's made for you and me

Mickey Mouse Mickey Mouse
Forever let us hold our banner
High! (High! High! High!)

Come along and sing a song
And join the jamboree!

這暢快感覺送給你 放棄了束縛滿天飛 (The joy is for you, set free and hover in the sky)
帶你到天際好歡喜 再跳起 與你飛 (It's my pleasure to take you to the sky, we leap for joy and fly)

這美滿慶典我共你 齋飛起飛起飛起 變出驚喜
我會帶你去飛躍萬里 齋飛起飛起飛起 創意沖天飛
跟清風擁抱 天空中裡起舞
誰飛起飛起 隨想象去歷奇

It's a sky high celebration
So come on, come on, come on
Let's fly away, (it's time to soar)
Take a flight on imagination
so come on, come on, come on
It's a brand new day (what you waiting for)
We'll chase the rainbows,
Wherever the wind blows,
So come on, come on
A Flight of Fantasy

Into the sky of flawless blue
this is a way just me and you
see how would all the dreams come true
set it high set it free

more details in wikipedia