This park is a great destination for hiking. Most of the trials are super well marked and many have even little bridges over the creeks (see picture).
In the winter the park also offers you great trials for skiing or snow shoeing. There is not quieter place than the backcountry during winter…
The trail out of Hollowell Park and along Mill Creek is a good easy hike. Not as difficult as the steep and rocky Bear Lake trails, but just as beautiful.