Here is a link that might help you determine whether or not it is safe. I personally have never had any issues in that City, with the exception of the City Inspector named Don. He is terrible to deal with. He will lie and is very rude. Anyone who sells a house in Hawaiian Gardens has to deal with him because the City requires a Pre Sale Inspection.
Heres that link: http://www.city-data.com/crime/crime-Hawaiian-Gardens-California.html
Coldwell Banker Star Realty
BRE Lic #01456982