The time is approaching when I need to give notice that I am leaving my job. In the past when leaving a job it has always been to take another job, and the process is simple: get new job, tell them I'll start in two weeks, give two weeks notice.I am thinking that I will give my manager three weeks notice this Friday, since I can. I am wondering whether my resignation letter should mention the reason for leaving (the thru-hike part, not the I hate my job part), or if I should stick to simply stating my end date as I usually do. Any thoughts?