Start here and take a few lessons before you try to rent a sailboat. Or you will find yourself stuck in the middle of the lake unable to get back to shore
http://www.hooversailingclub.com/
This is a good beginers boat. You can't go wrong with a laser, snipe or thistle for your first boat.
http://columbus.craigslist.org/boa/3597656207.html
I grew up racing a S2 7.9 and these boat still bring top dollar for being 25+ years old
http://www.sail79s.org/board/viewtopic.php?f=9&t=1495
http://hottamaleracing.com/s279events/IMG_9554sm.jpg
http://s1.hubimg.com/u/1576_f520.jpg