The only place where you can "see" Tink is before the Wishes fireworks when she flies from the top of the Castle. As wdarling mentioned, Peter carries Tink in his lantern in "Share A Dream Come True" Parade at MK but she's invisavle. She also flies through the final unit of SpectroMagic and in the finale of Fantasmic in animation form.
One thing you might want to do if she's a Tink fan, there's a shop in Fantasyland called "Tinker Belle's Treasures" just to the left of the Castle (byMickey's Philharmagic). If you are the first person into the shop at opening, you can wake Tink up for the day and she will fly around the room. All you'll see is her pixie dust though- no character. I believe it opens every day at 9am (not sure about on EMH days though).