Investing in Detroit suburbs - safety issues?

[Diana B.]

After some analysis, I've decided to invest in Detroit suburbs (Warren/Sterling Heights) or possibly further out (Grand Rapids/Ann Arbor). 

I will be buying and holding from out of state, but I do want to visit now and then, at least initially as I get set up.

Is there anything I should be mindful of in terms of crime/safety while travelling to these cities? I hesitate to say it, but especially as a woman travelling by herself? E.g. should I avoid flying in from the Detroit?