Regarding Plattekill: I stayed at the Colonial Motel a couple of years ago. It was ok, nothing bad, nothing great, although it was good to have the Pizza joint less than 100 yards away. http://www.colonialmotel.biz/
Plattekill is not very close to the Thruway, at least an hour's drive. Staying at teh motels listed on Plattekill's page makes sense.