Every place here is somewhere you can go outdoors in Connecticut or New York. They're grouped by who owns and runs the land, because that's what decides whether you can walk in, what it's likely to be like, and who to ask when something's unclear.
The colours above say who runs the land. This says what it actually is — the sub-label on every card is a land-management term, and most of them don't mean what they sound like. A wildlife management area is somewhere you can walk; a watershed protection area often isn't.
The rule: paid-but-open-to-anyone stays, exclusive-entry goes. A town beach charging non-residents is public. A members-only lake association is not.
CT DEEP's property records, the National Park Service, US Fish & Wildlife Service and Army Corps of Engineers, OpenStreetMap, USGS PAD-US, and the Connecticut Forest & Park Association's Blue-Blazed trail system. Elevation comes from USGS 3DEP. Everything is rebuilt from source rather than typed in by hand, so corrections belong upstream — though a handful of places OpenStreetMap has never heard of are added manually.