Cache series starts on an old trail I discovered while walking along the lake one day. The most current information I have on it is that it was built in the 1960's at some point to allow people a trail to get down to the lake. It have been upkept by some kids and locals doing some rabbit snaring. The trail is in great shape, side a few sections that are a little wet / have old boardwalks that were built that have since rotted out considerably. I would be weary about bringing a small dog along with you due to the snares, but I bring my own (he's medium sized) all the time and he's never had any issues.
Trail head is located just behind the tourist information hut on the highway. You start down the dirt road leading to the old ski hills and maybe 20 to 30 feet from where the parking lot ends you'll find a little opening on your right. That is the trail. (the grass is slightly worn into a track leading to it.) It's a great hike in winter, as long as you're willing to sink in some snow. I wager it will be very bad for flies and mosquitos once they start up.
The trail itself isn't difficult but the return climb might be a little taxing for someone who's not used to climbing up a fairly steep hill.
PS If anyone know anything more about this trail, please let me know. I've asked all over the place and not many folks have heard of it.
PSS I'm going to add a rough sketch of the trail in case people are curious.