You used to be able to do the fun Rehitchin Ceremony at the Garden Grille in The Land at Epcot. They discontinued it some time ago. I don't know why, it sounded so cute and fun!
Maybe that's the one you're thinking of.
If you want to fork out the big bucks you can have your vows renewed by Disney in an elegant and official way!
http://disney.go.com/vacations/disneyweddings/vows/index.html
Congratulations to you both!
I've spent the last month trying to find something nice to do for our 5th Anniversary to surprise my DH too. I booked the fireworks cruise and requested champagne and chocolate covered strawberries brought to the boat. That's the only surprise I could come up with.