There are many things that you can arrange. First of all, the Disney Florist is excellent. My DH had a dozen roses delivered for our last anniversary spent at the GF and the vase was etched with Mickey & Minnie. I think they were probably the most beautiful roses that I've ever received.
You can contact the GF bakery and they'd be happy to do a small replica of your wedding cake. They also have other speciality desserts that you can order.
Yes, there is Victoria & Alberts, but you can also arrange to do something more personal with private dining. Perhaps dinner served out on your own balcony. The theme pool closes at a certain time (8pm?) and depending on that, maybe they could put a dinner table inside one of the cabana's. Truly romantic. Or even chocolate covered strawberries and champagne served on the beach. A Wishes fireworks cruise can be booked and again, something served on board.
The spa/healthclub is delightful. You can book a treatment together, or simply use the lounges. Each has their own area with separate sauna, steam room and whirlpool.
Definitely spend an evening at Mizner's lounge in the main building. The orchestra plays there nightly and it's truly enchanting.
Hope that gives you a few ideas.
Tammi