Campsite decorations during the holidays are AMAZING! Yeah, some over just over-the-top gaudy, but there are just so many cool ones. Definitely worth a visit if you are at WDW when they are up.
Walking is doable, if your family is used to a decent amount of walking. You can ride the internal bus some and walk some. A golf cart is a LOT of fun, too, and would allow you to more easily see most or all of the loops.
This makes me really miss Fort Wilderness!