A traditional letterbox is another form of treasure hunting using clues instead of coordinates. Once a letterbox is found, instead of signing a log book - you place your stamp in the letterbox's log book and place the letterbox's stamp into your own log book.
This cache is a letterbox hybrid and has coordinates, making it a letterbox and a geocache. You can leave your stamp and get the cache's stamp in your own log book like in letterboxing, or you can just sign the log book as in geocaching, or do both.
I think this cache is a "Great Play!" because it is a super easy geocache combined with nearby coffee and food - a triple play. (Plus you can park within a few feet of the cache and probably see it before you get out.)
Please leave the inkpad and stamp with the cache - they are not trade items. Also, there is an unactivated trackable for FTF.