March 19-20 and 26-27, generally 10am-4pm daily. Learn more and find a participating sugarhouse at the New York State Maple Producer's Association or the Upper Hudson Maple Producer's Association.
We drive all the way to Kent's in Berlin for our fix - read a detailed description of our 2009 visit. (It's a nice drive, mostly following the route of the colonial-era Eastern Turnpike through Rensselaer county.)
I've discovered that it's better to buy several small jugs, rather than one large one, to help keep the freshest flavor. (The air in a half-empty jug seems to diminish the zippy maple taste.)
I'll post a great maple-walnut muffin recipe later this weekend - check back.