Classified for credit

WV state park featuring a historic grist mill, river gorge ecology, and Appalachian forest biology with developed trails.

Coastal national wildlife refuge with barrier beach, marsh, and dune habitats — supports shorebird ecology and Atlantic coastal geography.

Iowa's oldest state park featuring limestone bluffs, trout streams, and diverse hardwood forest — supports ecology, geology, and watershed biology field study.

Florida Keys state park — coral-reef snorkeling, beach ecology, and tropical Atlantic flora.

Texas state park built around a 1.5-acre artesian spring-fed pool — desert hydrology and endemic fish.

Large national forest in the Cumberland Plateau with waterfalls, caves, and diverse Appalachian ecosystems — supports ecology, geology, and outdoor education.

America's oldest living botanical garden, established 1728 — covers native plant ecology, colonial-era botany, and naturalist history.

MA state park featuring a dramatic 60-foot waterfall — geology, erosion, stream ecology, and physical geography via a moderate hiking trail.

Working family orchard and farm with pick-your-own operations — applied plant biology, agricultural economics, and seasonal food production.

Remote Maine wilderness park containing Mt. Katahdin — supports ecology, geology, wilderness navigation, and physical education through hiking.

Columbia River Gorge state park built on a volcanic basalt monolith — covers geological history, river ecology, and Pacific Northwest flora.

Sacred volcanic butte state park combining Great Plains geology, Native American history, and trail-based geography and ecology studies.

Drive-through wildlife park featuring native North American animals — supports zoology, wildlife behavior, and conservation education.

Nature center within Pinnacles National Park featuring cave talus formations and native wildlife habitat — supports geology, cave biology, and ecology.

State park on a high-altitude glacial lake with opportunities to study freshwater ecology, geology, and shoreline biodiversity.

Large Hudson Valley state park with ranger programs — covers Appalachian ecology, watershed biology, and physical geography.

Federal migratory bird refuge on the Great Salt Lake with visitor center and auto tour — covers shorebird ecology, wetland biology, and the Pacific Flyway.

Drive-through and walk-through wildlife park near Route 66 — covers North American fauna, conservation biology, and animal behavior.

Oklahoma state park featuring forested mountains, trout streams, and the Broken Bow Reservoir — supports ecology, freshwater biology, and Ouachita Mountain geography.

Oklahoma state park with forested Ouachita Mountain terrain, a nature center, and the Mountain Fork River — covers riparian ecology, native wildlife, and forest biology.

Formal gardens and historic estate on the Mobile Bay delta — covers horticulture, plant taxonomy, landscape design history, and Gulf Coast ecosystem ecology.

Missouri state park centered on a natural spring and trout hatchery — covers freshwater ecology, fish biology, and karst spring hydrology.

County zoo with diverse animal collection — covers zoology, animal adaptations, and wildlife conservation for younger students.

14,000-acre privately owned forest and arboretum in Kentucky with labeled tree collections, trails, and a nature center — covers dendrology, forest ecology, and conservation biology.