I noticed that there is a new parking lot being built on Rt 25 with a trail head. It is located on the north side of Rt 25 next to one of the old Lustgarden buildings. The lot has a locked gate around it. Here's a Google Map location with Earth view:

https://www.google.com/maps/place/Port+Jefferson+Station,+NY+11776/@40.8892362,-72.9107546,167m/data=!3m1!1e3!4m2!3m1!1s0x89e840e077add627:0x48964a4dc03f787d

The picture is a bit old and doesn't show what the attached pictres show ... also there is a ramp and mounting setup for horse back riding. 

Can't expect CLIMB to update it's maps ... we'll have to wait until RP opens up for more exploring.