If you take a look at a map you will see Route #100 in Katonah
(which can be reached either by the Tachonic or #684). If you follow Route 100 North you will run into route #202. Along this route which eventually joins #684 there are a number of very well known trout streams. You have the river that flows from Croton Falls (catch and release only),but holds "native" fish over 10 lbs. Continue to follow 202 north and you will come across another trophy trout stream. This one flows from Sodom Reservior (artificials only) but you are allowed to keep 3 (i think) over 14". Also in between these trophy trout streams there are numerous smaller streams that hold holdover, stocked, and some wild trout as well. That should be plenty to get you started.
perfect, thank you so much!