This is a nice little environmental reserve with some paths to follow. I was with Grandpa Muddy so we did a short path. Next time I'll head into the "upper woods" path and see what the trails are like. However, starting at the nature reserve, the paths really are not good for strollers. Or really for baby carriers either. The wooden path (shown above) has lots of overgrowth and no railings. It's difficult to cross paths with another stroller going the opposite direction since the wooden paths are off the ground and are not very wide.
I could have worn the carrier (and should have but my back hurt) but if you go off this path and onto the next path it is wood chips and very uneven. It does go along the water and is pretty, however strollers can't be rolled easily though the wood chips and tree roots that make this path difficult to traverse. Wearing baby in a carrier would definitely have increased the risk of me falling and hurting one or both of us since it would have limited the visibility of the path (I front wear still). Tripping over a root would not have been ideal. There are also some steps along the path (not marked on the map) along the water to the observation deck. These steps are not something I would have wanted to do with the carrier and were difficult with the stroller (but Grandpa helped carry the stroller up/down them :) ).
The water level is low this year and looking through the nature is really beautiful. We saw a deer though I didn't get a picture. There were some deer tracks along and across the low water areas.
I'll be heading back to the "upper woods" area in a couple weeks and we'll see if that area is better for strollers or carriers. The "upper outer" loop runs along the Valley Trail (trail that runs through multiple cities) so I'm sure the Valley Trail will be paved even if the upper outer loop is not.
So, my recommendation if you start from the nature reserve itself is to take kids that can walk steadily on their own and are not so young that they will run off on the paths.