It is near the beach in east corner of the isle.
in a bolder
the top
About halfway between the dock and the eastern end of the isle, by the northern beach
there is no riddle box
There none.
If you follow the western edge of the part of the isle that bumps up south, it will be in the forest, or if you head directly west from the dock and go a couple stride lengths south you should run in to it also.
In the northwest corner of the isle :)
There isn't a riddle box on every single Isle, but most have one... so there may not be one on Brown,but there might be...
It's near the north-eastern side of the forest
Switch Horses
On the light green bit between the three forests just south of the top river. You can find a screenshot of the location in related links.
It is by the southern south west edge of the light green grassy area in the center. -CalicoFilly