Maybe you could do a spa morning, and the cruise. Then you'd have a little special alone time(probably2-3 hours) and something great to look forward to with the family.
DH surprised me with the cruise for our 5th anniversary. He had wanted to rent thhe "Breathless", which is Disney's gorgeous wooden boat, but unfortunately it was out for repair, so we couldn't do that. We got one of those pontoon canopy party boats instead, which was nice too. Basically, they drive you around the Epcot waterway...you know, from Epcot, through the Y&B Club,Boardwalk area, to MGM...for about 30-45 minutes before IllumNations starts. Then you pull into the water in Epcot and sit under the bridge between France and England. When IllumiNations starts, it's like you are right there!!!! It's awesome!!!! I think DH paid like $120 for that and it was 6 years ago, so I'm sure the price has gone up. I also think they'll do food or snacks on the boat if you want. I know you have to call the Y&B Club marina directly, but I don't know the number.