Thinking can be used for Fun. Vacation can be used for Fun. Vacation is related to Tourist. Tourist is related to Hotel. 
Elderly is the opposite of Young. Young is related to Master. 
Thinking --UsedFor--> Fun <--UsedFor-- Vacation <--RelatedTo--> Tourist <--RelatedTo--> Hotel 
Elderly <--Antonym--> Young <--RelatedTo--> Master 