
Reading Town Forest is a large wooded area in the north of Reading. It skirts the Ipswich River, and depending on weather and recent rain you might get close enough to view the river.
In any case there are lots of trails to explore in forests and wetlands.
Here is a very interesting interactive tour of the forest.
More Resources:

Town of Reading PDF Map
Trail map by town of Reading for all the many trails

All Trails for Reading Town Forest
Trails maps and more info.