I have a summer home in Cooperstown and will be there this weekend to close the place up for the winter. This is a great time of year to be there, no crowds, beautiful foliage, etc. Be sure to check the Hall of Fame website and also the chamber of commerce.
www.cooperstownchamber.org There is always something going on. We went to the giant pumpkin festival a couple of weeks ago. The winner was over 1500 lbs. Then they hollow out the pumpkins and try to make boats out of them. Hilarious!
I believe that Harmon Killebrew will be there this weekend doing an event at the HoF. The Hall of Fame Fantasy camp is the following weekend. You can watch the games at Doubleday Field. Not sure who will be there this year but I have seen George Brett and Ozzie Smith in the past couple of years. If you plan to go during the World Series, there is a program where you can watch the Series at The Hall of Fame, you need tickets in advance but it is very cool as they have trivia contests between innings, serve hot dogs, etc.
I agree with Ted that should check out Portabello's Restaurant in Fly Creek. Also, if the tour boat is still running, you should take a tour of Otsego Lake. If you are into fishing, as I am, this is a great time of year. The boat yards are closed so you can't rent a boat but can still probably get a charter and fishing guide. Spending a morning on the lake is beautiful.