6-mile run is right on Cortelyous lane. The land that makes up 6-mile run is scattered in parcels. Runs along south middlebush rd, griggstown rd, and rt 27 as well. One parking area is by the soccer field on rt 27. Look for the park signs. Another parcel at the 90* bend on corteylous.
Rutgers has Heylar woods in New Brunswick off Ryders lane. Hutchinson forest on 514 is also managed by RU. Hutch is touted as a 'virgin' forest.
Colonial park now has access to the canal with a new footbridge near the rose garden.
Sourland Mtn preserve off rt 614 in hillsborough is an excellent hike with unique topography as it is boulder strewn. North and south of the ridge you couldn't find a big rock as it is predominantly shale.
There is a very large parcel of land located near the griggstown causeway within a hundred yards or so. Entrance looks like someone's driveway but you will see a sign indicating public land. Don't think it is part of 6-mile run but the land is mostly fields and woods.