Canyon Lakes is an excellent community in which to live and raise children. No one can guaranty your total safety. Bad stuff can still happen in good places. The likelihood of bad stuff happening in a quality neighborhood is low.
However, had I waited until 2003 I would have made killing and probably wouldn't still be hustling RE today. I have several friends who purchased when I did, have raised their families there and continue to live there today. One of my best friends a retired OC Chief of Police has lived there for years and couldn't think of a better place to enjoy his Golden Years. Good Luck.
Canyon Lakes is great community. There is a security gate which minimizes outside traffic and unknown persons entering the community. If you need additional information about moving to San Ramon, please let me know.
Have a great day,