If you aren't riding the rides, maybe bring your camera and use the time to do some pretty scenic pictures. I've seen some wonderful pics that people have done at Disney, but I've never had the time to recreate them for myself. I've told my husband I want to do a "photo vacation" at Disney just for that reason. Maybe search on flickr for Disneyland pictures to see what others have done. I bet you'll feel really inspired!
This is what I was going to suggest. I went to Disney and did a TON of fun stuff and Peter Pan & Spaceship Earth (which is a bit jerky) was about as crazy as I can ride. There are tons of little details and hidden stuff to do if you can't ride.
At all of the parks:
Take photos with characters
Parades
Shows
At the Magic Kingdom:
Detail photos of Main Street windows
Walt Disney statue
Roy Disney statue
Lady & the Tramp paw prints
Photo cutouts/old cartoons (I think there was also a timeline on the wall) in Exposition Hall (and it's air conditioned!)
Look for the paintbrush on Tom Sawyer Island (be one of the first boats over in the morning)
Ride the double decker bus/car from Cinderella's castle to Exposition Hall
Take a photo of you with photo of Walt Disney (I think this may have been on the wall under the railroad station)
Carousel of Progress in Tomorrowland
In Epcot:
Explore Innoventions and Imagination Labs displays
Living with the Land boat ride through the greenhouses
Country hopping in Epcot
Another boat ride in the pyramid in Mexico (Gran Fiesta Tour with Donald)
In Japan, watch the candy lady transform sugar into animals
If you have Park Hopper, ride the boat between Epcot and Hollywood Studios
Animal Kingdom:
I went on the safari ride but if that is too much for you there are animals to see where you can walk
Hollywood Studios:
I enjoyed taking photos of old cars, buildings, etc.
Near the Indiana Jones Stunt Spectacular there is a sign that says "Don't Pull The Rope" but the "Don't" is sort of crossed out -- Definitely Pull The Rope!
Take photos of the characters in the Muppet Fountain. Which main character is missing?
Lots of hidden things and puns in the preshow as you enter Muppet 3D
I took photos inside the Muppet store -- it looks a lot like the Happiness Hotel from The Great Muppet Caper
Check out the Singing in the Rain umbrella
Explore the city backdrops -- pretend you are in New York or San Francisco
Go to You're a Character -- take the quiz to see which Disney character you are most like
Take photos of the hand prints outside the Chinese theater
If the boys are going to be on roller coasters for awhile, go to tea at The Grand Floridian hotel (I made reservations)
Sit in the lobby of the Grand Floridian and listen to the live music
Take photos of the different hotels
Search for Hidden Mickeys
Have fun!