Lounsbury Pond is in Blue Mountain Reservation and not really that close to the Appalachian Trail or Beaver Pond. Sterling Forest is about 45 minutes away. You cannot camp at Blue Mountain Reservation. Stillwater Lake is in Putnam County and the trail near it is unmarked and not named. Says Jane Daniels
Nearby you discover the Queensboro Lake to a mile above 9W segment, a class IV(V+) sweep of whitewater. It's a delightful 1-mile-long sweep on Penlolopen
Brook. Whitewater boaters on this sweep of Penlolopen Brook should have quite a bit of familiarity in whitewater kayaking or rafting.