Incredible Journey: The Athabasca Sand Dunes in Saskatchewan are isolated and accessible only by float plane or boat—arrangements can be made with local tour outfitters.
From left: Barton Perriera sunglasses, $455, Spectacle. Insight bathing suit, $100, firstname.lastname@example.org. ASOS cotton blend top, asos.com. Weston scarf, $295, net-a-porter.com. Marc by Marc Jacobs cotton dress, $260, Holt Renfrew.
Outside River Lodge and Cabins on Athabasca Lake
From left: O’Neill bikini top, $65, and bottoms, $50, oneilleshop.ca. Loeffler Randall sandals, $275, elux.ca. Smart Set cotton shorts, $35, Smart Set. Isabel Marant cotton top, $725, jonathanandolivia.com.
Pack It: The Yonahlossee Riding Camp for Girls by Anton Disclafani (Penguin, $30)
Banished to an elite equestrienne camp for an unnamed transgression, Thea Atwell navigates its fraught social hierarchy while riding out feelings of grief and longing.