There are many little freebies at the parks, if you are willing to look around for them! Most notable are those buttons at city hall on mainstreet. They have birthday buttons, first-timer buttons, just married buttons, family reunion buttons, anniversary buttons, and I think they also have honorary citizen buttons! Buttons are a nice way to add pixie dust to your vacation, IMO. Also every time you pass a Cast Member, they will say happy birthday, or welcome, or whatever the occasion.
I have also heard of the CMs giving out free fastpasses for any ride except WOC or RSR good for up to six people. It doesn't always happen, but if you treat a CM nicely, or strike up a conversation with them, you just might be in luck! So be sure to be super nice to all CMs you see! They will for sure pixie dust you if you deserve it enough!