Seriously though check out these websites:
Let me know if you have any questions about a specific area. I grew up in Sacramento and have lived here most of my life so I'm very familiar with the area. It's a great community but so is Oceanside!
That is a tough question since there really isn't a neighborhood that is 100% crime free. I live in an exclusive community in Sacramento with an HOA community that offers 24hr armed security patrols and we still get crimes in our area.
Please feel free to go to http://www.sacpd.org/crime/ to get detailed information about the areas and specific crime info you need to know.