Eventually much of this information may be made available on the web. But the web is a very different medium than print and it needs extensive reorganization to make it suitable for web use. The links from the map are currently very incomplete with Fahnestock State Park being the most complete path. Besides this navigational approach, there needs to be a database search capability based on many criteria, e.g. length, difficulty, scenery rating, etc. I am not personally aware of any such ambitious database work on the web for trails databases.
Virtual hikes are another possibility.
Help is welcome.