Greenbrier Nature Center is a nonprofit organization that offers environmental education and conservation programs to the public. Located in Sandwich, the center features a variety of habitats, including wetlands, forests, meadows, and ponds, that support a rich diversity of wildlife. Visitors can enjoy hiking trails, wildlife exhibits, a nature library, and a gift shop. The center also hosts special events, such as bird walks, nature crafts, and seasonal festivals. Greenbrier Nature Center is open year-round and welcomes school groups, families, and individuals who want to learn more about nature and the environment.

The Green Briar Nature Center is a sanctuary of peace and beauty throughout the seasons. It is located on the shores of Smiling Pool and adjacent to the famous Briar Patch of Thornton Burgess’s stories.

Green Briar is also the home to the Dr. Shirley G. Cross Wildflower Garden along with many small resident animals.