State

Sunday Gulch

South Dakota

Backcountry Trail

City, Town, or County

Sunrise Carriage Trail

West Virginia

Backcountry Trail

City, Town, or County

Sunset Drive Trail

Alabama

Backcountry Trail, Frontcountry Trail

Nonprofit

Superior Hiking Trail

Minnesota

Backcountry Trail

Nonprofit

Susquehanna River Water Trail - Middle and Lower Sections

Pennsylvania

Water Trail (other)

Nonprofit

Susquehanna River Water Trail - North Branch Section

Pennsylvania

Water Trail (other)

Nonprofit

Susquehanna River Water Trail - West Branch

Pennsylvania

Backcountry Trail, Frontcountry Trail, Water Trail (other)

State

Suwannee River Wilderness Trail

Florida, Georgia

National Water Trail

USDA Forest Service

Swamp Park Trail

Colorado

Backcountry Trail

City, Town, or County

Swan Creek Greenway Trail

Alabama

Backcountry Trail, Frontcountry Trail

U.S. Fish and Wildlife Service

Swan Lake Canoe Route

Alaska

Water Trail (other)

U.S. Fish and Wildlife Service

Swanson River Canoe Route

Alaska

Water Trail (other)