Hey,
I leave on Wednesday, and get to Biarritz on Friday, and onto SJPP after then. Last year I did a fair bit of solo bike travel in west/central/east Africa. Family and friends assumed I'd be pillaged/abused/shot/killed/etc. I probably would have thought the same, if I'd sat down and thought about it. It unfolded as one of the most 're-establishing faith in human beings' things that's happened to me. Out there, in every day life, most people are mostly good.
Once I got going, maybe a month in (it's all relative) I felt this huge weight lifting from my shoulders. I just felt like I belonged, not to anywhere in particular but just to everywhere. We can quite easily tune ourselves into different environments, you learn to get a feel for situations and people. If the situation or people are bad, just move along or join up with someone for a while. I think most of us now live in an overbearing environment where our instincts are made to feel redundant. Like Sarah says, you just need to be sensible in your approach and be aware of your surroundings. Not putting yourself into dangerous situations is as much about not going on a mountain/hill in a lightening storm, as it is about not being alone with a male you don't trust. I'm making the assumption that's one common cause of safety concerns.
You could just give yourself the first section to see how you feel. There are plenty of places you can opt-out if you don't feel right. Or you could just sight-see until a like-minded soul comes along you feel comfortable walking with.
have a good one, maybe see on the road...
doug