Sentier NB Trails: West Saint John - Musquash is a 18 mile out and back trail located near Saint John, NB and is good for all skill levels. The trail is primarily used for mountain biking and is accessible from June until September. 18.0 miles Out & Back mountain biking Expand Map Sign up now to see this map! Reviews (0)Photos (7)Recordings (0)No one has reviewed this trail yet. Be the first!