There is an old snowmobile trail/woods road by the Powley Place Bridge, that extends 2.5 miles west to Big Alderbed, that takes you to a wire crossing over the East Branch. The trail follows the East Branch for a short distance, then heads back into an interesting Old Growth Forest with a lot of big trails. To reach Big Alderbed -- which is largely drained wetland due to a failed dam -- you have to bushwhack along the stream to the mouth of the wetland.
This Overview Map of Piseco-Powley Road shows the campsites along the road, along with major trails and destinations along the road.
Sand Lake is a 1/3rd of a mile away from Piseco Powley Road. The trail is somewhat overgrown and marshy, so a paddle cart won't work for well for carrying a boat back here, but with another person you should be able to get back here.
The Meco Lake Snowmobile Trail can be found near Mud Lake on Piseco-Powley Road. It is walkable in the summer months, and is easy to follow the 1.4 miles to the end of state land, however a somewhat harder to follow trail continues beyond that with views of Meco Lake about a 1/2 mile further. The private land is not posted, however there is a sign requesting you remain on the trail.
The Sand Lake Trail is about a half mile long but can be a somewhat difficult portage at the end due to the swampy, narrow trail. But it's a nice little wilderness lake, with a campsite, not too remote off of Piseco-Powley Road. There also is a designated roadside campsite at the trailhead.