For all of Hawaii's natural beauty, some of what makes this such a beautiful place also makes it dangerous. A perfect example of this is the spectacular surf that arrives at the North Shore each winter. It is certainly as deadly as it is amazing to watch.
The most important thing beachgoers should do is consult with lifeguards about conditions at the beach that day. Let them know your experience level and ask about any potential dangers that can't be seen from the beach. Avoid beaches without lifeguard towers.