Sentence:  It is significant that the Catskills , which used to be the summer playground for older teen-agers , a kind of summer suburb of New York , no longer attracts them in great numbers - except for those who work there as <WSD>waiters</WSD> , bus boys , or counselors in the day camps . 
Meaning of the word marked with <WSD> tags:  a person whose occupation is to serve at table (as in a restaurant)