How many preserves & forests are in Boston, MA?
4 preserves & forests in Boston, MA are listed here: Brook Farm Historic Site, Gladeside Urban Wild, Hancock Woods, West Roxbury Parkway. Each page has parking, entry fees, and hours where they are confirmed, and says so where they are not.
Which preserves & forests in Boston, MA are free to enter?
Brook Farm Historic Site, Gladeside Urban Wild. Free entry is confirmed for these; the others either charge or have no confirmed fee on record.