My main goal was to find Harbinger of Spring in bloom. We found leaves from a number of different plants but despite all our looking none of us could find a flower or even a bud of the Harbinger of Spring.
We are fairly sure that the leaves below are Harbinger of Spring leaves. It often grows close to the boardwalk.
We did find the leaves of Puttyroot, an Ohio Orchid. The leaves are much easier to find than the blooming plants. By late April when the flowers are blooming the leaves are gone. The ten inch tall plants are hard to find among the other undergrowth. We noted landmarks where there were a lot of leaves so we would know where to look later in the spring.