And now for something different: A letterbox hybrid geocache.
Letterboxing - a close relative to geocaching - has been around much longer than the GPS. The origin of letterboxing can be traced to Dartmoor, Devon, England in 1854. A well known Dartmoor guide, James Perrott, placed a bottle for visiting cards at Cranmere Pool on the northern moor in 1854. From this, hikers on the moors began to leave a letter or postcard inside a box along the trail (sometimes addressed to themselves, sometimes a friend or relative)—hence the name "letterboxing". The next person to discover the site would collect the postcards and post them.
The two main differences between traditional letterboxing and geocaching are:
1) Letterboxing does not traditionally use coordinates, yet gives searchers a starting point and a set of directions on how to get to the hidden letterbox "cache".
2) A letterbox always contains a stamp, stamp pad and visitors book.
So - enough of the history lesson - what about this cache???
FINDING the "STAMP A SMILE AT THE SQUARE" CACHE:
True to the word "hybrid", you have two options to find this cache. You can choose below either the geocacher's method or the letterboxer's method. If you get a little stuck at one method or another, you can always use both. Since there are two methods here on how to get the cache, then no additional hints will be given. If you come to this hide with a friend or group, why not consider that one of you try to find the cache with one method, while the other tries the other method? Who will find the cache first? 
GEOCACHER'S METHOD
The coordinates posted bring you to Churchill Square, in the heart of St.John's. When there, you can find the old abandoned Dominion grocery store (the parking coordinates posted should have you parking right in front of it). Since a few city councillors did not like how Loblaws were just allowing the property to sit empty and decrepit, they insisted that mural-like photos were put in the store's windows depicting years ago. The geocache must be found by solving the field puzzle that uses these pictures and gives the coordinate values for A, B, C, D and E missing from the cache location coordinates:
N 47 34.AAB W052 43.CDE
There are five words in the slogan on the sign if we count the symbol in the slogan as a word, since the symbol represents a word. Using this slogan, the missing values are found according to:
A = the first digit on the license plate of the Volkswagen Bug
B = There is a five-letter word sign above the building in the picture which has the bug. The second letter in that sign that sign is the "B th" letter of the alphabet.
C = the two digits found on the rail car added together
D = Go again to the five-letter word sign above the building in the picture which has the bug. The first letter in that sign that sign is the "D th" letter of the alphabet.
E = there is a picture with some children whereby the boy on the left is holding some maple leaves. E is equal to the number of children in that photo.
If you think you have all of the correct values, go to the link below to confirm you have the correct coordinates, and make your way to the geocache! Remember, geocachers, sign the logbook! IMPORTANT: When you find the cache, please ensure you replace it just as found.
(Do not take the stamp or stamp pad from the geocache; these are not geocaching trade items.)

LETTERBOXER'S METHOD
To find the letterbox, go to the posted coordinates. As you face the the actual Terrace on the Square building, walk to the left corner of building. You will find stairs there. Go up the stairs, and then notice that there is a whole series of objects attached together. One of these attached objects is not the same as the other. The cache is contained within this different one out of the series. As a letterboxer, you will find the stamp inside for your stamp book and a logbook to stamp as well. IMPORTANT: When you find the cache, please ensure you replace it just as found.
We hope you've enjoyed this caching / letterboxing experience, and have learned how the two hobbies can go hand-in-hand from this geocacher's perspective. We have another letterbox in the metro area, GC7126T, if you'd like to find another letterbox hybrid.
Cheers!
CtB!