Excalibur at Funtown/Splashtown USA in Saco, Maine. The last time I was there, it had just been completed (probably 9–10 years ago now). It is a wooden coaster. The park is very small so there were very few lines. We rode it over and over again, without even getting off. It was amazing and so smooth. There is nothing like a wooden coaster in these days of steel.
They don’t have an official page, but here are a few sites that mention it:
Excalibur
another one
youtube