Walk to the canal site from the parking area right off Rt 38.
There are two fenced doggy areas, one for regular sized dogs, one for smaller dogs.
The walk starts with a wide path.
Soon you come to the amazing place where the Middlesex Canal went OVER a bridge!
Large wetlands surround the canal site. In dry times one might be able to cross the brook and explore the other side of the canal site.
There is a nice collection of glacial erratics; boulders dropped off in the last ice age.
This is the OTHER end of the trail on Butter's Row where there is no parking, but you can park on a side street near by.
There is a plaque right inside the trail site, with info on the remarkable history of the Middlesex Canal.
You walk on what was the tow path next to the canal.
Think of this canal, three feet deep, and almost 30 miles long!
The tow path now is a lovely corridor with little pine trees on both sides, in places.
Eventually you can reach the OTHER side of the cut-through.
Is this a collection of stuff that drifted in – or this is a case of beaver using a pallet in their dam?
Lots of evergreens here, but look at this collection of acorns that fell into the canal bed.
Wilmington’s Dog Park connects to a trail along the historic Middlesex Canal, a remarkable piece of history. The Dog Park is also known as Town Park. You can park right off route 38, also known as Main Street, to explore both walks.
More Resources:

Town Trail Maps
All town trails on a GIS map.

Wikipedia
Entry about the Middlesex Canal