I have a ton of pictures, so I'm just going to run through them the way a guest would have when arriving at the party.
The magic began with the invitation. I've loved making pop-up books and cards since I was in middle school, when my mom bought me a how-to book. This technique is the most simple, basic one out there, but never fails to amuse and impress:
When the guests first arrived, they saw the ribbon streamers staked along the front walk: