It's not technical but its defineitly better than doing your regular ride on the streets. I don't know if I should call myself a mountain biker. See, I love riding mountain bikes except I barely get to ride on any mountains. I ride the streets of NYC, the capitol of the world. Riding with traffic is extremely dangerous but if you have skills and common sense you will be ok.
Nothing compares to riding around Manhattan.
The city never sleeps and a bicycle is the best way to see the sights. You can ride through Riverside park by the Hudson river all the way down to Battery Park and then back uptown on the FDR Drive. Along the way you will see breathtaking views including the USS Intrepid, the Statue of Liberty and the Brooklyn Bridge. Central park has some trails and lot's of rocks, drop offs and other technical stuff. On or off the bike, 24-7, the fun never stops.