Hi and congrats on your upcoming marriage!
At the monorail resorts you can rent mouse boats and cruise around seven seas lagoon and bay lake. You can also rent other kinds of boats from the marina at the Polynesian. If you're a daredevil, you can go parasailing or water skiing from the Contemporary. There are also fishing excursions, if that's your thing.
At Wilderness Lodge you can rent mouse boats and bicycles. At Fort Wilderness you can go horseback riding or canoeing.
At Coronado Springs resort you can rent surrey bikes or mouseboats. I think they have paddleboats too.
At Boardwalk you can rent Surrey bikes, get your faces painted (could be cute?) and buy yummy treats at the shops there. YC/BC you can rent mouseboats, too. (Those things are everywhere!)
At the GF you can have a portrait done of you and they have afternoon tea at the Garden View lounge. Check out the menu on
www.wdwig.com. There is also a spa at the GF and they offer couples massages. Very romantic.
The Polynesian has the Luau which is a dinner show held twice nightly on certain nights. They also do a torchlighting ceremony and a lady bug release (I think...).
I think you can rent bikes at Caribbean Beach and Port Orleans. You can go cane pole fishing at Port Orleans.
From any deluxe resort you can book a fireworks cruise. Fantasy in the Sky cruises leave from GF, Contemporary, Polynesian and WL. Illuminations cruises leave from YC/BC and Boardwalk.
That's about all I can think of right now. If anything else comes to mind, I will post.