There are busses depending on how far you are from the schools. I think the limit it 2 miles, however, we're < 2 miles from the Elementary and Middle School my daughter has gone to and we still have a bus for both, although she's never ridden. Many neighborhoods are so close to schools, walking, riding bikes/scooters etc. is easy.
And yes, being family friendly is probably the biggest draw. All of the stores you mentioned are either here in FM or close. Close meaning within 10-15 minutes usually. As for malls, within 20-30 minutes you easily have 4 or 5 including 1 or 2 that some might consider a little more upscale. There are several more if you go into Dallas which depending on traffic could easily be 30-45 minutes tops depending on traffic, like the Galleria for example. Shopping is not in short supply!

Crime, here in FM is generally isolated to bored spoiled kids and vandalism and petty crimes like hot check kind of things. Traffic stops yield passers through in possession of things they ought not have or ought not be doing while driving. A few car burglaries which are 90% or more of the time, cars left unlocked with valuables, usually in sight. Dumb things. So the short answer is, crime is very low. It's rare to hear about anything major.
As for rent, for what you're likely paying in Nor Cal, you can come here, buy a 3000 sq ft house and lease it out while renting a 10k sq ft house.

Seriously, people move to Texas and are blown away at our housing market. You can get a lot of nice house for a fraction of what you can in other parts of the country. Depending on the house, in that size range I'd expect rest/lease to be in the $2500-$3000 range. That can vary of course from a pretty basic home to a much more custom. In the grand scheme of things, the average home in FM is in a price range much higher than most areas in Texas. Whether exaggerated or not, most people from outside the area know FM as being very affluent, yet more family oriented and conservative.
Good luck on your home hunt and move!
"We must reject the idea that every time a law's broken, society is guilty rather than the lawbreaker. It is time to restore the American precept that each individual is accountable for his actions." - Ronald Reagan