Spring is waterfall season. Blackwater Falls, Sandstone Falls, Cathedral Falls, Falls of Hills Creek and dozens of smaller cascades run at full volume, often framed by budding trees and wildflowers.
Some falls that dry to a trickle by August are spectacular in April. The trade-off is mud — trails can be slick and waterlogged, so waterproof boots and trekking poles earn their keep.
Build a route around a single region: the Blackwater and Canaan area, the New River Gorge, or the Monongahela National Forest near Marlinton, which packs several waterfalls into one day's drive.