Tourism is related to Vacation. Island can be used for Vacation. Island can be used for Refuge. Refuge is a synonym of Safety. 
Tourist is related to City. City is related to Business. 
Tourism <--RelatedTo--> Vacation <--UsedFor-- Island --UsedFor--> Refuge <--Synonym--> Safety 
Tourist <--RelatedTo--> City <--RelatedTo--> Business 