I would check in with The Bikery on Valley Rd. in Upper Montclair and see what routes they use to escape the congestion. The second place is Cycle Craft in Parsippany on rt 46 which is a large shop very involved in promoting mtn and road riding. Those couple miles farther west mean that they probably have it easier doing club rides from the shop. I live by the swamp and there are a lot of riders from your area, the Oranges, Livingston, Milburn that come through Eagle Rock, Eisenhower, to Passaic through Chatham into the swamp. Not a short loop though and a lot of traffic. Check out the shops for ideas into Morris County, etc.