Downtown Sandusky will be full of police so you shouldn't have a problem there. Perch tacos at Dockside Cafe are awesome. Stay away from Daylies pub, all of the riff raft will be there this week.
Stop by the Volstead for a proper Manhattan if you can get a seat. Don't spend money on the Cedar Point property including the McDonald's and Dary Queen on the Causeway if you don't have to.
There are plenty of small towns in the area with antique stores and the such. Many nice people to meet if you give them the chance.
Milan also has a great museum complex. If you can get past the love of Thomas Edison, there are many cool things to see there.
Vermillion, Port Clinton, and even Norwalk should have enough shops and other things to keep you occupied.
Erie County conservation league has shoots every Saturday and Sunday. Take a look at the schedule to see what is going on. Don't let the staff at Cedar Point know if you are bringing firearms, they will make you check them at the front desk.
There is actually a lot to do at Cedar Point without even going into the park. Take a walk down the boardwalk at dusk, or at sunrise, your wife will love it. Hang out at the beach, rent a jet ski, go parasailing.
If you want to go fishing, find the Clevelander over at Sawmill Creek for a great head boat. Don't know what they are fishing for right now, but you most likely will find either perch or walleye.