Fall is the best time of year to visit Cooperstown.  The baseball tourists are mostly all gone after Labor Day and the fall leaves start to change color early.  Nestled at the foot of Otsego Lake and the mouth of the Susquehanna River, it's right out of a storybook as the fall leaves reflect off the lake, known as "Glimmerglass" for a reason.  There's also a fantastic art show and flea market on Labor Day weekend.  If you like snow, winter is also lovely but the town is quite desolate.  There's a lovely gingerbread cottage, which is Santa's home during the Christmas season and Main Street is adorned in beautiful garland and white lights with seasonal music piped in, to complete the mood.  There's a great winter carnival usually in February.  Spring is also nice, just stay away during peak tourist season.  The town is too small to manage all the tourists between Memorial Day and Labor Day.  If you do go in summer, just be prepared for crowds but there's a trolley that will transport you from the Fenimore House, north of town or from the high school south of town, so you won't have to deal with trying to park your car downtown.