Schenectady's Central Park--this is the location for the mountain bike races sponsored by Plaine's (they have one scheduled for later on in October so come and practice on Wednesday). It's a lot of fun with some hills, planks, log stairs, roots (but no rocks). It's similar in difficulty to Lock 7. For photos of what you're getting yourself in for, see: http://www.pbase.com/j_harvey/32606_race
Disclaimer: The Capital MTB, ride leaders, and organizers of all rides and events listed on the www.CapitalMTB.org website are not liable for personal injuries or any other damages incurred while participating in the ride or event. Mountain Biking is an inherently dangerous activity. Any individual, by deciding to participate in this activity, takes on the responsibility for their own actions and safety while participating.