Some modern versions of the classic storm cellar can be purchased to install under your garage floor either at the time of building or aftermarket. They are usually steel with a sliding door on top that allows you to continue using your garage for parking in. They tend to be rather close quarters inside.
Although hurricanes are rare in Hawaii, their season is from June to November. They often result in tropical storms which can cause damage, power outages and flooding. Hawaii residents have learned, when a storm warning is in effect it pays to be ready.
While the technology to construct earthquake-resistant buildings has existed for many years, tsunami-proof housing is very much in its infancy. Evacuation to higher, safer, ground is pretty much the best option, but if your home is hit by a significant wave, the amount of damage that it could cause could be astronomical.