Getting Lost with Boys by Hailey Abbott

Cordelia Packer hates the unexpected, but she's in for a surprise when Jacob Stein offers to be her travel companion, all the way from San Diego to her sister's place in northern California. Before she knows it, her neatly laid out summer plan has turned into a wild road trip, where anything can – and does – happen. Who knew getting lost with a boy could be so much fun?