Whatever you do, steer clear of Hudson Hills, the new muni in Ossining. As for The Garrison, I rather enjoy it for a casual round, but it's not an easy course to walk and there are definitely some indifferent holes out there. The Garrison's a great place in peak leaf-season, though, with some wonderful views from its perch high above the Hudson.
Branton Woods and Unionvale are both very good bets. BW is my favorite of the Bergstol courses that I've seen--his bunker style seems to work pretty well on that property. UV is long and (in my opinion) quite tough. The site is bisected by a rather wide environmental zone, which creates for a daunting lateral hazard on a handful of holes.
The other CCFAD up there is Centennial GC. It's not bad or anything, but it feels a little bland compared to BW and UV.