If you want to take a cab over, the fare shouldn't be too much, since it's right by WDW. Celebration is, ahem, interesting. I'm personally not a fan; it's just too ersatz for me. I don't like the whole McMansion with 5 feet of yard around the house thing, but it is nice to walk around. There is a lot more walking area than the one lake at the Yacht & Beach Club area someone else mentioned. They have a string of ponds, with walkways from one to another. Just beware attack squirrels - they line up on the walkway, waiting to be fed, and aren't above making sudden movements toward you, to intimidate some food out of you!
The restaurants are okay, but overpriced, but it is a nice walking area. I used to meet my husband for lunch over the summer, and we'd walk all around - it was very peaceful, much more so than the Disney parks, especially since you're going in December.
Cheers!
Heather W