I was there May 17-21,2005, but my niece met me for a couple of days so I wasn't by myself for the entire trip.
I would do it again

I had a character breakfast in which I think I was the only adult dining alone that morning wearing a "tiara" (hope I spelled that right). The CM's were great!

I also walked around and looked at the 3 main hotels,
Disneyland Hotel, Grand Californian, & Paradise Pier. I stayed at the Carousel Inn, which was within walking distance-approximatly 1 block.
The day I got there was not bad for crowds, nor the following morning, but the afternoon of the 18th schools must have been let out early because it was packed then until I left on the 21st. I know the one night they were keeping California Adventure open longer/later for a school party.
One afternoon as I was walking back to my hotel I lost my digital camera case which had my camera and vouchers in it. I went back and checked at Guest Relations and some nice soul had turned it in. What a relief that was!
As you probably already know DL is just a smaller version of WDW. If you are comfortable going solo to WDW I don't see you having any trouble doing the same at DL.
Have fun planning and a magical time.
Montana Minnies
