I am a big sucker for Harry Potter soundtracks, so I am going to write an incomplete list of all the great orchestral music you will hear at WWoHP and whereabouts within it! That way, you can download any individual tracks that remind you of your vacation!
Flight of the Hippogriff:
A Window to the Past
Hagrid the Professor
Buckbeak's Flight
Harry Potter and the Forbidden Journey:
Secrets of the Castle (Castle queue)
Hedwig's Theme (loading station)
Harry's Wondrous World ("Ron and Harry will meet you outside!")
Hedwig's Theme ("Hermoine did it! They're Flying!")
The Spiders (the forbidden forest sequence)
The Quidditch Match ("Showing off to your Muggle admirers, Potter?")
Mr. Longbottom Flies ("We've made it! To the Great Hall!")
Harry's Wondrous World ("You're free to return to Hogwarts any time. Now, tuck your elbows in!")
Dragon Challenge:
Harry Sees Dragons
Golden Egg
Hogsmeade area music:
Potter Waltz (most frequent)
Neville's Waltz
Leaving Hogwarts
Reunion of Friends
Entry to the Great Hall and the Banquet
Diagon Alley and the Gringotts Vault
The Flying Car
Fawkes the Phoenix
Double Trouble
Aunt Marge's Waltz (very frequent)
Christmas at Hogwarts
Fireworks
Dumbledore's Army
Flight of the Order of the Phoenix
Very incomplete, any more ideas?