Something wilder / Christina Lauren.

"Growing up the daughter of notorious treasure hunter and absentee father Duke Wilder left Lily without much patience for the profession... or much money in the bank. But Lily is nothing if not resourceful, and now uses Duke's coveted hand-drawn maps to guide tourists on fake treasure hunts through the treacherous and storied red rock canyons of Utah. It pays the bills but doesn't leave enough to fulfill her dream of buying back the beloved ranch her father sold years ago. Treasured land wasn't her only loss that fateful summer, and when the man she once loved walks back into her life with a motley crew of his friends ready to hit the trails, the usually self-reliant cowgirl is thrown. Frankly Lily would like to take him out into the wilderness and leave him there. Leo Grady knew mirages were a thing in the desert, but they'd barely left civilization when the silhouette of his greatest regret comes into focus in the flickering light of the campfire. Ready to leave the past behind them, Leo wants nothing more than to reconnect with his first and only love. But Lily Wilder is all business, drawing a clear line in the sand: it's never going to happen. Unfortunately, emotions won't be led like a horse to water, and even out in the desert it's impossible to ignore the heat of attraction. But when the trip goes horribly and hilariously wrong, the group realizes the idea of hidden treasure wasn't so crazy after all. Finding themselves alone in the isolated and dangerous mazes of the Canyonlands, Leo and Lily must decide whether they trust Duke's maps-and each other-enough to risk their lives and hearts for the adventure of a lifetime."-- Provided by publisher.