It's a dangerous and/or scary world out there, and Cincinnati has a lot of places to see. Follow me, and I'll help you to find things that are worth your time in Cincinnati if you plan on spending a little extra time in the area around the wedding.
Cincinnati has a fantastic zoo which is well worth the visit. Though they try to cover it up, Harambe was killed here, and you can still find his picture in the gorilla exhibit's timeline. Also, the kangaroo exhibit lets you walk around inside of the kangaroo enclosure. It felt like I was really at an Outback Steakhouse.
There's a legendary aquarium at a walkable outdoor space called Newport On the Levee (also worth a visit). Word on the street is that if you bring a big enough backpack they let you take a penguin home with you from the penguin exhibit.
Delightful artisan market with several local restaurants and craft stores, including several 'fancy plant' stores that the dames just love. There's also a free trolley which goes around the area and might by itself make the trip worth it, if trains are your thing. Something for the girls, something for the boys.
Cincinnati has an incredible (and free!) art museum which also happens to be one of Helena and my first date spots. I think that, because entry is free, if you pay, they just let you take art off the walls. Either that or if you bring googly eyes you can put them on the artwork. There are some stunning Duvenecks that are just asking to be googly eyed. Highly recommend.
Cast your vote in the great Cincinnati Chili dispute. Skyline puts cocoa powder in their chili, and they serve it on top of spaghetti and hot dogs, which technically makes it a salad and/or a mixed drink rather than an entree, so drink up!
Neuschwanstein is castle is nowhere near Cincinnati, but it is a premier European winter travel destination. Nestled in the rugged Alpine hills in the very south of Germany, near the border with Austria, they say that to see the ice and snow sparkling off the fair battlements is to see the very twinkle in the eye of God. Check it out sometime if you want to.
To be honest, I am to this day unsure of what a conservatory is. According to my uncle, "it's a room with glass windows where you stay warm during the winter months and grow plants." If his word is to be trusted, this would be great news for the dames. Last time I went there was a really cool model train exhibit which, if my word is to be trusted, would be great news for the fellas.
While not the church Helena and are getting married at, this beautiful Catholic Church is our home parish and a strong contender for most beautiful church I've been inside. It's also the sister parish to Sacred Heart, the church we'll actually be getting married at.
One of Northern Kentucky's finest churches, Covington Cathedral is definitely worth a visit. They're actively in the process of restoring the cathedral's many gargoyles, so, if you know any gargoyles, this could be a great place to point them toward during their stay. I make it a point not to associate with gargoyles, but people have different sensitivities to such things and this is probably a situation where two people of good will could rationally disagree, so I leave that up to your discretion.