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the OP, be aware that following single track mt. bike trails is hit and miss, even using TrailForks. TF is a collection of rides that have been tracked by others (similar to road routes on RWGPS), then uploaded to TF. As such there can be trails existing in a park that have not been documented and uploaded, thus trying to get turn-by-turn can be incorrect as the TF database may not show many trails. As opposed to road routes, mostly based on Google maps, that pretty much has a complete data base of road infrastructure. Just heads up.