Walk down the footpath from the main road and you'll get down to the lake.
The cache is hidden near a large green storage container.
We recently replaced the box after comments. It's see through with a little plastic bag for the long book.
We've hidden it quite high so it doesn't float away in winter. ;)
When we hid it included a Spiderman Pez Dispenser, log book, pencil, sharpener, some rubber bands and clothes peg (don't ask).
Happy hunting.