Marsh-Billings-Rockefeller National Historical Park is Woodstock's serious sight, a landscape of mansion grounds, carriage roads, forest, and conservation history on the slopes of Mount Tom. It tells a more thoughtful story than the village's pretty surface suggests.
The trails are open for walking, and guided tours of the mansion add context when available. Even if you skip the house, the carriage roads and forest paths make a rewarding half-day, especially in autumn.