When walking along the Forgotten Coast, I kept seeing crazy trees all over the place that looked like huge bonsai trees. These are actually ficus aurea trees, also called strangler figs. This particular cache is hanging on one of them.
You're looking for a small container with a camo paint job. There are multiple ways to reach it, whether walking along the trail in the woods or going along the shore. You may see it from a distance; it shouldn't be hard to find if you've walked far enough.
There may be a few muggles here every now and then hiking or fishing, but it's called the Forgotten Coast for a reason - it doesn't normally have a ton of visitors.