If you are coming to MWLUG 2010 or not, one of the nice gems of Ohio is Put-in-Bay, OH on South Bass Island. Put-in-Bay is the site of Perry's Victory and International Peace Memorial commemorating Commodore Oliver Hazard Perry's September 10, 1813 naval victory over British ships in the War of 1812. The island has a lot of camping and beautiful caves.
To get to the island you need to take a ferry. Car traffic is terrible since the ferry only runs at certain times and cars are lined up like crazy and there are only so many car slots. When the ferry ends for the day and you are not across, then you are stuck on the island until the next day. I suggest you leave your car at the parking lot. It is beautiful this time of the year. I am hoping we have enough time to visit the island after MWLUG 2010.