Welcome to the Disneyland at Christmas/Holiday Season Superthread,
Brunolvr!
I thought that someone else would have responded to you and given some ideas, but no one did!
Well, first of all, let me say that you are in for a treat! If you love Christmas/the holiday season, you will absolutely adore it at Disneyland Resort. It is -- and I don't think I am the only one who feels this way -- absolutely wonderful, charming, magical, enchanting, beautiful, etc. I think that you and your daughter will have a great time!
I will suggest all of the expected, obvious things to do/see, but chances are that you would discover them anyway:
Seeing the Winter Castle at night (aglow in icicles);
Riding It's a Small World Holiday (and see that at night too, as the lights are stunning);
Haunted Mansion Holiday;
Jingle Cruise (the Jungle Cruise with holiday touches);
Viva Navidad in California Adventure (a vibrant, jubilant, uplifting celebration);
A Christmas Fantasy Parade; and
Believe in Holiday Magic Fireworks (with snowfall on Main Street at the end of the show), etc.
However, if your bad back might be an issue for Winter Dreams, it could be an issue when waiting for the parade or fireworks too. (I have a bad back as well, so I can empathize!)
You might also want to try the Holiday Time tour, so you can get reserved seats for the Christmas Fantasy Parade, as well as priority boarding on Haunted Mansion Holiday and It's a Small World Holiday. You will also get a treat sample of some kind, a pin and a cookie and cocoa.
Some holiday things that some people may miss around Disneyland Resort:
The Storybook Land Canal Boat ride. There are teeny tiny Christmas decorations on the cottages and lawns along that ride, which a lot of people probably overlook;
The "Winter Ornament Workshop" for onsite hotel guests only. At the Grand Californian Hotel (easy to walk to from the Disneyland Hotel, the Workshop was making snow globes last year);
The "Merriest Holiday Hunt" (another onsite hotel guest exclusive; I have not done it and no one seems to know what it entails because it has been kept quiet, but I'm sure it will be available again this year -- it must be a scavenger hunt sort of thing);
IF it is happening during your time at Disneyland Resort -- and I am not sure if it will be, as the schedule is very limited -- the Gingerbread Workshop at Ralph Brennan's Jazz Kitchen in Downtown Disney is very popular;
There is an ice rink in Downtown Disney as well;
Take some time to visit the Grand Californian Hotel lobby and have a seat in one of their deceptively comfortable chairs. You can get a snack or beverage and bring it with you. The giant Christmas tree in the lobby, the nearby hearth, the pianist, guitarist, Dickens Carolers and Santa all appear in the lobby during the season, and the atmosphere is really relaxing and festive at the same time;
If you and your daughter like the occasional adult beverages, Trader Sam's in the Disneyland Hotel always gets rave reviews, and there are also fun Christmas decorations inside;
Don't miss the small gingerbread houses in Storytellers Café at the Grand Californian Hotel and in White Water Snacks (also at the GCH);
Check out the miniature gingerbread model of the Cozy Cone in the office of the Cozy Cone Motel in Cars Land;
Visit the Jingle Jangle Jamboree in Frontierland for music, holiday crafts, a petting zoo, characters in holiday attire, candy cane-colored cotton candy, etc.;
You could order an In-Room celebration for your hotel room (with a mini-Christmas tree, basket or stocking of some sort); and
If you are up for a visit with Santa, he can be found at all 3 hotels and in both parks.
I could go on and on, and I'm sure I would still leave out a bunch of things!! Hopefully someone else here will be able to think of something else to suggest to you!
Stick around -- we have been doing our annual Theme Week Countdown in this thread for the last few weeks (which features lots of Disneyland Resort holiday photos broken down into themes), and will be doing it all the way up to Monday, 11/3. We are on our 4th theme of the Countdown this week (Buena Vista Street and Hollywood Land), and we have already covered 3 themes (Santa Claus/PhotoPass/Holiday Characters; Believe in Holiday Magic Fireworks/A Christmas Fantasy Parade; and It's a Small World Holiday/Fantasyland). Lots of photos have been posted, and there are lots more to come.
We can help you try to find info if you don't know where to look in the thread, or on the forum.

