Grand River Park at 9473 28th Avenue, Jenison, Georgetown Township, Michigan.

Pretty park to roam around. Trails going into the woods to walk on. One trail we would've liked to walk further but it was covered in water and I didn't have the right shoes on to be trampling through there. There's a nice boardwalk that extends into the pond, where you can throw a line in and catch a few small fish. There are a couple lookout points to view the scenery from above. There's also a playground for the kiddies and maintained bathrooms for your use. I'm not sure if they're unlocked year round though.