Why does lenina have second thoughts about going to the savage reservation with Bernard

Bernard and Lenina cross the Atlantic and go to a hotel near the reservation. Bernard warns her that the reservation lacks any sort of games or amusements, and that she might be bored. She quotes her hypnopaedic learning: "progress is lovely." She insists on coming with him. They both go to the warden of the reservation where they receive an introduction to the "savages" that live there. They learn how the savages remain in an older way of life where they bear children naturally, speak various languages, and obey religious principles. When they get there Lenina is horrified by the dirt, sights and smells.