Future travelers should avoid passing too close to the rings. There are many depictions of the asteroid belt in science fiction movies looking something like this. In reality, the asteroid belt is almost entirely empty space which makes it a lot safer than Saturn's rings.

There is a chance that the Cassini spacecraft could strike one of these particles during the final phase of its mission, but the scientists are very good at their jobs and made sure to minimize the risk so that all continues as planned. It's certainly not traveling anywhere near the larger pieces, but even a very tiny one could really do some damage. Cassini's mission will end this September, and a lot of people will cry. I might be one of them.

I used a particle system in Blender to create a basic image and then did some digital painting to make it look a little less like a 3D render.