Constitution Marsh Sanctuary (Indian Brook Rd., off Rte. 9D, 845/265-2601, www.constitutionmarsh.org [1], 9 a.m.–dusk Tues.–Sun. year-round), a 207-acre tidal marsh, is managed by the National Audubon Society. An interpretive nature trail and boardwalk run through the preserve, while at river’s edge is a visitors center (9 a.m.–5 p.m. Tues.–Sun. May–Oct., free admission). The sanctuary is rich with birds—194 species have been spotted—and wildflowers.
In the preserve are canals created by farmers who hoped to use the marshlands to grow rice. Once a day at high tide, from May through early October, the Audubon Society runs guided canoe trips through these canals. The trips are free but are enormously popular, and reservations must be made weeks in advance.
Links:
[1] http://www.constitutionmarsh.org