It's in BKK, and it's NOT a micro. It's a small wooden box with
a log, a pen, a treat for first finder, some stuff, and plenty of
room for more stuff. It is indoors, in a very public space, so make
the grab when no muggles are looking.
Finding it:
(1) Look for water.
(2) If the water has fish, shell, seahorse, turtle, and starfish,
then you're in the right place.
(3) Once you've found the right water, look at the guide picture
below. X marks the spot.
The hint tells exactly how to interpret the guide picture, so
don't decode it unless you arrive at the spot and STILL can't
understand what the picture means.
(if you can't pull it out, you can push it out from the other side
with a stick or paper)