Lord Stirling Stables in Basking Ridge is a county stable with a lesson program. Not fancy, but good people. They have ring lessons, lessons on the trail and I think once you show them you can ride, you can rent to ride/trail ride
They also have a big Friends of Lord Stirling Stable group that gets involved in all sorts of things from a pony party program to bringing in clinics and demonstrations. We used to work with them on the Carriage Driving Event they ran for a while.