First of all I familiarized myself with the location of the sequence- Central Park Zoo. I went through the first 'Madagascar' on dvd, freeze-framing the key locations and making layout studies & geographical notes.
Then reading through the script I start to jot down any thoughts, ideas for business and key images that strike me.
Then I thumb-nailed out the entire sequence-fleshing out the character business and camera angles
Lastly I worked it up on the 4x3 story board pads provided-I didn't get all the way through but had the end of the sequence covered in the thumbnails above.