Sussex County Trail - L&E Trail - Paulinskill Valley Trail. 20 miles of gravel/dirt trails. Much of it is single-track. This will be a moderate ride, around 8 mph.
Definitely a fat tire ride, nothing less than 1.5"/38 mm. Things to watch out for: mud, these are wet trails, even on dry days. Things to bring: plenty of water, at least one spare tube, helmet.
Anyone familiar with the area who can recommend a good place to eat after please speak up.