Greg Bradshaw:
Colombia is an amazing country to visit but a few things to consider before deciding to go:
- you should speak Spanish or someone who goes with you speaks Spanish
- do not stick out like reading maps out on the street etc. Avoid to dress like some American tourists like to dress when going on vacation. Avoid printed t-shirt/shirts etc. No one should be able to spot that you are a tourist from distance
- If you do not speak much Spanish. Try not be loud in public. Just try to melt in.
- Cartagena is very touristic so you may want to start there on your first trip. You will hear plenty off other tourists speaking English and you would probably feel comfortable. In other big cities your whole stay might pass without you hearing English speaking people
- your look. This is harder to do anything about (except clothing) but if you are very blond and tall you would stick out. Besides that you have all different colors in Colombia.
I felt like you before my first trip to Colombia (that I have to be prepared any second that something was going to happen). It is not like that in my opinion if you apply the things I wrote above.
Travelling on the countryside requires a lot of research and in general I would advice against it if you are not an experienced traveler. I do not mean a 30 minutes bus trip to a local river (they are fine) but more longer trips in areas where it has been problems in the past