Greetings Sabrina!
Tinker Bell is such a fun character to meet. She's full of spunk and energy.
A character dining experience with Tink sounds like a fantastic idea. I wish it were offered! However, you can visit with Tinker Bell and her other Pixie Hollow friends at their meet and greet area inside of Magic Kingdom Park.
Tinker Bell's Magical Nook is located in the Adventureland Area of
Magic Kingdom Park. If you're coming from the main entrance, head to the left and pass in front of the Crystal Palace. Once you cross the bridge into Adventureland, Tink's Magical Nook will be on your right-hand side. If you pass Aloha Isle, you've gone too far. Just pick up a Dole Whip and head back to see Tink.
I suggest picking up a Times Guide when you enter the park and checking out their meeting times and trying to get there directly prior to the Nook opening as lines can often get long.
I hope you have a pixie-dusted vacation!