Xeni although I no longer live in Toledo, I did for about 8 years and from Ohio myself. Although Ohioans have long had a right to OC it has been little practiced until recently. All Ohio laws regarding the carriage of firearms were pre-empted by the Ohio legislature effective May, 2007, which killed the effectiveness of local laws which may have prohibited OC. As a result OC is something relatively new to many in urban areas including Toledo. There have been some recent issues particularly in northern Ohio for OCers as recorded here, however the Ohio Attorney General has been requested to issue a formal statement clearly stating for all of law enforcement that OC is legal.
As a former Ohioan who also has the permits to carry concealed I typically carry concealed when in Ohio unless I am familiar with the areas I go. If you don't mind CCing while in Ohio, it may result in less hassle for you although it is perfectly legal in many places. Cedar Point is likely the place that you have been invited to (between Toledo and Cleveland) and while you will likely havea bundle of fun riding the roller coasters, firearms are forbidden at the park if Irecall.
If you don't get too many answers on this board you may want to check www.ohioccw.com (Ohioans for Concealed Carry, which also discuss Open Carry) and www.buckeyefirearms.com for further info and discussion. Enjoy your trip to Ohio and bypass Rudy's and request to go to Tony Packo's instead.