My First Choice for something Special would be:
DaVeed's at 934
Address: 934 Hatch St
Cincinnati, OH 45202
513-721-2665
This place has really interesting things on the menu that you won't get elsewhere. The Lobster with Pear Salad is a very unique combination, they have a great duck/pheasant etc.
http://www.daveeds.net/wordpress/
Or try
Orchids at Palm Court
Address: 35 W 5th St
Hilton Cincinnati Netherland Plaza
Cincinnati, OH 45202
513 665 2560
This place is also really, really good and if I remember right is in the Top 5 in Cincinatti and top 50 in the USA. The dining room here is right out of the 1920's and very cool. The meals are amazing.
www.orchidsatpalmcourt.com
Jeff Ruby's Precinct
Address: 311 Delta Ave
Cincinnati, OH 45226
Phone: 513-321-5454
or
Boca
Address: 3200 Madison Rd
Cincinnati, OH 45209
Phone: 513-542-2022
http://www.boca-restaurant.com
Have a fun trip