From the nature center, there is a parking lot, about 100 meters of gentle sloping rock / dirt path (with a bench mid-way and at the top of the stairs), then about 50 stone stairs with a handrail and a bench half-way, and a final 100 meters of gently rolling dirt / rock path. Wheelchair / stroller won't fly but walker / cane with assistance and determination will find the peaceful river worth the work.
70 steps on the stairs down to the river bottom
It depends on your abilities if its difficult or not, just remember that every step down is half as hard as every step back up! However, there are a couple very easy trails near the inn that are pretty easy. Also, you could drive around to the covered bridge and be close to the creek, but you will miss out on the suspension bridge.
The stairs are plenty. A sit bench halfway. Not handicap accessible but with a cane perhaps.
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