Besides doing the things you love - doing new things together - and doing the great stuff everyone here writes about ( and avoiding what they say to avoid)?
Buy something dated so 30 years from now you have a sweet memory. Maybe it could be something "graduation" themed or maybe just a dated ornament that you can hang on the tree and show your kids and your grand kids (it will be hanging next to the ones you bought with them during your trips together!).
Interact with the Cast Members, especially in Epcot. What language did you study? Have fun using it with the international cast. (I teach high school language so stop saying you can't, which I know you're saying right now.). Try. You'll see their faces light up and you'll have fun trying. You can also purchase the little passport kits they sell. Have the cast members sign them. They'll write a welcome in their language and stamp it. You could always let the elementary kid inside you come out to play and color a Duffy or Perry mask. Cast Members will stamp them, too. You'll even have your name written in their language in Morocco, Japan and China. The CMs in China will ask for your birthday year and will stamp it with the appropriate "year of the horse, monkey, etc" for you. The CMs in Japan usually add a little origami bow.
Wear "I'm celebrating!" pins. Congratulations on graduating!!!
