Silent Lake offers a perfect setting for enjoying the natural beauty and tranquility of the lower Canadian Shield. The forest is a mix of deciduous and evergreen trees, with birch, maple, hemlock and white pine the most common species. The trees are mostly second growth as the area was opened up by loggers in the 1800s. Visitors can see reminders of the logging period in the remains of logging camps scattered throughout the area, and huge, blackened stumps of trees consumed by fire long ago.

A wide variety of wildflowers grows throughout the park, including the rare rose pogonia, rattlesnake fern and toothwort. Otter, mink and beaver live in the marshy areas near the shoreline of the lake and deer can often be seen on higher ground.