I finally found time to watch the video. Very impressive! It illustrates the risk, even if you arn't right on the beach.

One further comment about evacuating due to a warning of a distant tsunami vs a tsunami generated by a nearby earthquake. In the case of a tsunami caused by a distant earthquake you might have several hours of warning. Time enough to grab your evacuation kit, hop in your car, and drive to high ground.

In the case of a tsunami resulting from a local earthquake, you might have only a very few minutes to escape. Roads are likely to be jammed by others trying to get away. The earthquake might have damaged or destroyed bridges or blocked roads. If you feel a strong earthquake it is probably better to escape on foot. Run like hell! Do not stop to grab your kit! Do not try to use your car. Get immediately to the highest ground available!

If there is no high ground nearby, there are other possibilities for safety. As the video shows, big, stoutly constructed buildings might survive and provide refuge. Even really big trees might work, though this would be an absolute last resort. High ground should always be your first choice.