The best places that we have found the characters:
Arrive early and characters will be near the entrance and at the beginning of Main Street
Chip and Dale in the Firehouse on and off during the day
Mickey and Minnie at their house we have waited but it has never been too bad.
Skip the Princess thing horrible line moves so slowly and you never know which princess will be there until you are at the front of the line.
Pooh characters past splash mountain I think the area is called Pooh's corner
At certain times a princess will be tell a story in the castle gift shop
Watch the parade you will see lots of characters but you can't take a picture with them
Although you can see characters easier at Calif. Adven. they will not be in there traditional outfits. Most of the ones I remember seeing had on safari or Hawaiian shrits. Although Calif. Adven. has some great scary rides I would not go there if I only had 11 hours.
I hope you found this information helpful, we go to DL every two years and have spent a lot of time finding characters when our girls were little.
Somebody did suggest a character meal which is one sure way you would meet some characters. We go to Goofy's Kitchen for dinner every trip. It is next to the
Disneyland hotel - you would take the monorail to Disneyland Hotel stop exit and walk a short distance through part of DTD. You will probably want to ask for some directions because the restaurant is by the pool area which is not that visible. I know there is a character meal at DL to but have never done it. We did go to one in CA (many years ago) but were not impressed at all, the characters were wearing sailor outfits.