The hazards of travelling at light speed are somewhat different to the hazards of travelling at other speeds. Since the only things that can travel at light speed are massless particles, to travel at that speed you need to convert yourself into a massless particle.
In effect, you need to convert yourself into an information-carrying beam of particles, for example a radio or laser message of some kind.
In such a form you would experience exactly no passage of time between being transmitted and being received.
What would be the hazards of travelling in such a form- as a beam of information? Well, the worst one would be data loss. Even a laser beam or highly collimated radio beam would lose strength over interstellar distance; important parts of the message might be absorbed by the interstellar medium. So it seems advisable that the message would need to be transmitted at very high power and with a lot of repetition/redundancy.
Finally the last hazard such a message would face is the fact that there might be no suitable receiver at the far end. Such a receiver would need to be capable of picking up a fantastically weak interstellar information beam, and would also need to be capable of converting the beam back from information into a human space traveller.
I can’t see any way of guaranteeing that over interstellar distances and timescale. If such a method of travel ever becomes possible, it seems that a voyager will have to travel in hope of a successful arrival rather than in certain knowledge of the same.