After a 4-week backpacking trip (via NOLS), you're given the opportunity to write a letter to yourself that they would send to you in the future (can't remember how long, maybe a year). After 4 weeks of living out of a backpack in the Alaskan mountains, your perspective changes. They knew this and wanted you to give yourself a reminder of that perspective after it has faded back to the complexities of normal life. You really develop a different, and imo healthier, mindset about life.