Similarities Between Hawaii and California: Both have volcanoes. Both make most of their money from tourism. Both have a large border with water(Pacific Ocean). Both have beautiful beaches. Both are popular vacation spots.
Differences between Hawaii and California: Very different population sizes. California more populated. Size. California is much larger. Hawaii is a group of islands and is not attached to the continental U.S. California is not an island. California borders other states. California became a state much earlier than Hawaii.