I have the Unofficial Guide to
Disneyland which has a few sample itineraries. They are pretty much geared for adults w/ no kids -- or geared mainly for kids -- not really a mix of the 2.
Here is the plan geared toward kids: (this isn't my plan, but the book's plan

)
Arrive at the gate 30-40 minutes prior to opening.
Go to Fantasyland -- ride Dumbo, then Peter Pan, Alice in Wonderland, Mad Tea Party
(we did all of the rides in Fantasyland that we wanted to at this point, but the book has you coming back to Fantasyland)
Go past Small World and cross under Disneyland RR to Mickey's Toontown
*Do the Roger Rabbit Cartoon Spin, Gadget's Go coaster, Goofy's Playhouse, Mickeys house, Minnie's house, Donald's boat
Leave toontown -- take Disneyland RR from Fantasyland/Toontown station to New Orleans Sqare (walk if you have a stroller that doesn't collapse)
Go Left after exiting train station at go to Critter Country
*Go to Winnie the Pooh ride
(we also got some treat at Pooh's sweet shoppe and did some photo ops with Eeyore and Tigger here)
Go to New Orleans Sq. and do Pirates of the Carribean, then Haunted Mansion
Take raft to Pirate's Lair (there is a show at certain times here, too)
Catch Disneyland RR at New Orleans Sq and return to Fantasyland/Toontown station
In Fantasyland, ride It's a small world -- go to Casey Jr. Circus Train and then to Storybook land Canal boats -- ride King Arthur Carousel, then Pinocchio's Daring Journey
Head to Frontierland -- ride the Mark Twain Riverboat or Sailing Ship Columbia
Go to Adventureland -- go to Tarzan's treehouse and Enchanted Tiki Room
Go to Tomorrowland (cross central hub and follow path on the right side)
Get a fastpass for Autopia
*see Honey I shrunk the audience (may be too scary for little ones)
*Ride Autopia -- then get fastpass for Buzz Lightyear (when your window opens for getting another fastpass)
**We modified this general plan to fit our own needs. Don't forget parades, meals, potty breaks, etc. Also, adults will probably want to ride Space Mtn and Thunder Mtn, Splash Mtn and the Matterhorn. You might want to split up if your 4 year old isn't tall enough or is scared to go on these rides.
Good luck and have fun!
