Classified for credit

Only frost-free botanical garden in the continental U.S. — supports tropical plant biology, conservation of rare South Florida species, and island ecology.

Philadelphia Zoo's children's zoo section focused on animal care, conservation, and hands-on wildlife encounters for young learners.

Coastal lava-field state reserve with anchialine pools and sea turtle habitat — covers Hawaiian geology, marine biology, and coastal ecology.

Kauai coastal refuge with active seabird colony and lighthouse — covers Hawaiian seabird ecology, nesting biology, and island biogeography.

Working county farm park with animals, crops, and seasonal programs — covers agriculture, animal husbandry, and the history of Maryland farming.

Asian-species animal exhibit at Fresno Chaffee Zoo — comparative zoology, Asian ecosystem geography, and wildlife conservation.

Pennsylvania state park featuring a partially collapsed historic railroad viaduct — civil engineering history alongside forest ecology trails.

Maine wildlife preserve with large exotic and native animals — zoology, wildlife conservation, and ecological stewardship near Acadia.

Major Pacific Flyway wetland complex hosting hundreds of migratory bird species — covers waterfowl ecology, wetland biology, and bird migration science.

Family-run alligator farm and tour — applied zoology, reptile biology, and wetland ecology in a hands-on Louisiana bayou setting.

State park featuring sedimentary rock spires and desert geology — covers erosion, stratigraphy, and arid-ecosystem ecology.

Kauai state park at 3,600 ft with rainforest, canyon overlooks, and a natural-history museum — endemic plants and Hawaiian ecology.

8,000-acre native tallgrass prairie research station — one of the last intact tallgrass ecosystems, supporting grassland ecology and conservation biology.

Working cattle ranch on O'ahu with valley tours covering Hawaiian ecology, land history, and film-location geography.

Historic estate featuring elaborate topiary sculptures and formal gardens — covers horticulture, plant shaping techniques, and garden design.

Research and display garden focused on native Texas plants — covers botany, plant adaptation, pollinator ecology, and regional horticulture.

Self-guided wildlife drive around Lake Apopka — supports field study of Florida wetland ecology, migratory and wading bird identification, and watershed restoration.

Minnesota state park on a glacial lake with bog boardwalks, old-growth forest, and ranger programs covering northern forest ecology.

Cascade Range state park on the Yakima River with old-growth forest and wetlands — covers Pacific Northwest ecology, hydrology, and watershed geography.

Florida scrub and wetland park with a living-history cow camp, native wildlife, and ranger-led ecology programs.

NPS recreation area centered on the largest US reservoir — covers arid-land ecology, hydrology, dam engineering history, and Mojave Desert geography.

State park on Possum Kingdom Lake with rock climbing, paddling, and geology — Palo Pinto formation outcrop study, ecology, and outdoor education.

Large Missouri state park on Lake of the Ozarks — Ozark ecology, freshwater biology, cave geology, and outdoor recreation with ranger programming.

Clear-water reservoir state park in the Ouachita Mountains — supports freshwater ecology, geology of the Ouachita uplift, and outdoor recreation studies.