There are some great restaurants. Schmidt's Sausage House in German Village, Le Chatelaine in Dublin (authentic French), the Starliner Diner is a funky little Cuban place in Hilliard near Dublin. The largest air museum in the world - The US Air Force Museum - is an hour west in Dayton. My house is 45 minutes west, Hocking Hills state park to the south is great if you want to get outdoors, the COSI science museum is cool.
Here is a list compiled by tripadvisor
Things to do in Columbus: Check out 74 Columbus Attractions - TripAdvisor