Sentence:  Washington's home as a national shrine in 1860, reacted ambivalently toward later proposals for electric streetcar service between Washington and Mount Vernon. They worried that the “wrong sort” of people would flood their property. Indeed, they felt that mass tourism as opposed to <WSD>class tourism</WSD> could compromise the diffusion of Washington's legacy. 
Meaning of the word marked with <WSD> tags:  Tourism catering to a wealthy elite (contrasted with "mass tourism").