What I am waiting for on this Wednesday: Instructions for a Broken Heart by Kim Culbertson (May 2011)
Ha, I love that care package title!
Three days before her drama club's trip to Italy, Jessa Gardner discovers her boyfriend in the costume barn with another girl. Jessa is left with a care package from her best friend titled "Top Twenty Reasons He's a Slimy Jerk Bastard," instructing her to do one un-Jessa-like thing each day of the trip. At turns hilarious and heartwrenching, Instructions for a Broken Heart paints a magical Italy in which Jessa learns she must figure out life-and romance-for herself.
Summary by Goodreads