Patrick,
Garrison is a public course designed by Dick Wilson, and opened in 1963.
It is on some really hilly property, with wonderful views of the Hudson, and includes some dramatically uphill and downhill holes.
It's quite challenging, with some long par threes providing the bulk of the difficulty. There are a number of water holes on the back nine, and it's a bit too tree-impinged, but it's both enjoyable and scenic.
I think Tom Doak gave it about a 4, and listed it in his "dumb blondes" category, for looks without substance, but it's a bit better than that, IMO.