If it's in your neighborhood and not across a freeway, then a twelve year old should be able to get to the park on his or her own. Most 12 year olds in the US are in 7th grade. Middle school is old enough to be able to go to the park alone.
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C, according to the Disneyland website, Guests 14 years old or younger must be accompanied by an adult when visiting the Disneyland theme parks. While your child can ride many attractions solo while in the parks, you will need to accompany them during their park stay.
In fact, visiting alone might make your theme park visit even better than going with a group. Almost all of my theme park trips these days are solo visits, so I know what it's like to be in the parks alone... except that I am never alone, being surrounded by thousands of other theme park fans.
Some children have the maturity to start babysitting as early as age 12 or 13. Others are better off waiting until they're older teenagers. Before you let your tween babysit, demand the same qualifications that you would from any babysitter you are considering hiring.