You may not need a boat but you
will need to find a way to walk on water..
Cache is located on this cute
little island which may or may not have water to cross depending on
the time of year. You will need to look for the obvious log. The
container may change often.
Here is what it "sometimes" looks
like.

Jnyx fgenvg bhg gb gur Vfynaq. Jura lbh pna'g tb nal shegure ybbx gb gur yrsg.
Fvta gur "Ybt" naq lbh ner qbar.