From what I remember, it's a bit of a walk. We always just moved our car. The
Lego area is in the Marketplace and it really is something to see. Disney Quest is right near CDS and the kids would love it. There is a separate admission (if it's not on your park hopper) and I believe it's about $25/pp. There are usually discounts if you use
AAA. Also, I think the BIrnbaum's book has a coupon in the back for 10% off. It's an indoor arcade but there are also many virtual reality rides and you can design a roller coaster and then ride it (virtual reality). There's a human pinball game and bumper cars and many interactive exhibits. Your kids are the perfect ages.
The memorabilia store mentioned earlier is called Starabilias and that is also on the West Side. It's a cool store to look around in with many things of interest for the kids (lots of things from Star Wars, Harry Potter, etc.)
I don't remember Rainforest Cafe being there, but there is a Planet Hollywood which is pretty central. House of Blues is also there as well as other good choices for all of you in eat in.
We love the DD area and always spend quite a bit of time there. Have fun.