As far as I can tell, this island, just north across a narrow channel from the boat ramp and wharf, hasn't been blessed with a name. Perhaps it's cursed, or maybe it just didn't exist at the time the islands around here were named. Either way, officially it's zoned as "Recreational Waterway".
The cache is a grey plastic cylinder about 6cm long hanging low in a tree and includes a stubby pencil.
My thanks to lee737 who 3D-printed the containers for this series.