A letterbox hybrid is a combination between gps navigation (to posted coordinates), multi cache adventure style (picking clues on site), and old-school hunting for the cache without gps
Important Note: In the cache there is a special rubber stamp. It is part of the cache. DO NOT TAKE THE STAMP!
What to do with the stamp? There are people who carry a diary with them, and collect stamp marks from these letterbox caches, from around the world. If you don't have a diary or a notebook as such, you can start one, or just stamp a paper, as a souvenir and proof you found this cache.
זהו מטמון לטרבוקס היבריד, קומבינציה בין ניווט גי פי אס לנקודת המוצא, חיפוש רמזים כמו במולטי, ומציאת המטמון עצמו בדרך הישנה והטובה בלי ניווט גי פי אס
בתוך המטמון יש חותמת ייעודית, נא לא לקחת אותה! ישנם מחפשים הנושאים עימם יומן או מחברת לאיסוף חותמות, אפשר גם פשוט להחתים דף או פריט אחר כמזכרת
Now how to find this cache?
At north corner of the boulevard with Ibn Gabirol st, there is a plaque commemorating Prochter Square (see pic). Do not confuse it with a similar one commemorating the rennovation of the boulevard. Find it and count the number of words on it (last word is a hebrew year with " in the middle, count it as one word). Let that be A
Start walking on the boulevard itself and count the number of trees on both sides until you reach a crossing. Let that be B
Add these two numbers, and deduct one. What you get is a number of a pole (pole = A+B-1), somewhere further down the boulevard. Find that pole. There are "mailboxes" near ground level on both sides throughout the boulevard, few of them are open. Cache is hidden in such a mailbox, next to that pole.
Note: Although hide is safe from muggles, since it is so low and nobody passes next to it, still the area can be busy, with traffic and people walking. You can crouch or sit, use your bag as an alibi, be stealthy, and when it is relatively clear take/put back. It would be recommended to stay for a few minutes nearby to make sure cache is safe. Make sure it is deep enough. good luck!