East Coast USA: Class 2 or below 24 miles/ 24 hours

Hi!

Seasoned hiker, new paddler. Looking for some training hikes near Maryland.
Concept:
park/ startpoint-12 miles along river, hike any terrain (+/- 8 hours)
campsite (+/- 8 hours)
paddle back Class 2 or below: (+/- 8 hours)
Nantahala, Youghiogheny, Susquehanna, Potomac, Shenandoah
March-June

Looking for routes that others have done that might meet this criterion. Thanks!