Downtown Disney is wonderful, but it can be overwhelming, especially if you try to do it all at once. I'd start at the Marketplace, skip Pleasure Island (not much to see or do until evening), and see if you have the energy to try the West Side.
Your kids will love the new toy store (Once Upon a Toy I think it's called). You can build your own Mr. Potatohead among other things. Don't miss the World of Disney, probably the largest
Disney store around. The Christmas shop is neat, no matter what time of year you go.
As far as food goes, there's lots to choose from. If you want something unique, Wolfgang Puck has an express shop in the Marketplace that is yummy, but your kids might not like it. There's Rainforest Cafe, but that can be a bit much for lunch. There's also a McDonald's if your kids are really picky.
As far as your husband goes, there's lots of benches to warm while you shop.

Even if he's not much of a shopper, there should be some stuff to interest him.
There's not as much shopping at the West Side, so if you don't get to it, I wouldn't be too concerned. My favorite stores there are the Virgin megastore, the Cirque Du Soleil shop, and House of Blues (which is also a great place to eat if you make it over there). I'm not a fan of Bongos, and the main Wolfgang Puck is too pricey in my eyes for what you get.