South America Solo?

Wondering if any women have travelled through South America recently and how their experiences were?

I am thinking of travelling there for 3 months and was wondering what a realistic itinerary might look like. I have been to Peru already - loved it and had no problems.

Has anyone been to Colombia, Ecuador, Chile and or Argentina recently? Which cities were the best and which should I avoid?

Also in terms of transportation, did anyone have problems on busses etc? Does anyone have experience renting cars here?