There's the Columbus Commons (it's a great green space and often has music and food trucks). There's 2 awesome theaters (Ohio Theater & Palace Theater). Scioto Mile is a string of parks on the Scioto River.
Best Pizza around ! Seating can be a challenge during peak times so consider doing it as take-out.
This is walking distance from where the ceremony/reception will be.
Polaris. Need I say more? Shopping and Food !