Final answer:
The best thing to do during an earthquake on the coast of the Island of Hawai'i is to head inland immediately to ensure your safety in case of a tsunami.
Step-by-step explanation:
During an earthquake on the coast of the Island of Hawai'i, it is important to prioritize your safety and take appropriate actions. The best thing to do is to head inland immediately. Earthquakes near the sea can trigger tsunamis, which are waves that can bring destruction to coastal regions. Tsunamis can travel at high speeds and cause significant damage, so it is crucial to move away from the coast and to higher ground as quickly as possible. Continuing to enjoy the beach, getting on a surfboard, or making calls and plans might waste valuable time and put you in a dangerous situation.