I feel I should be more useful to you, as I grew up in Ft. Thomas, KY, right over the big mac bridge from downtown cincy.
That said… where the #$#$# did I ever ride in high school?
Maybe five mile road, Cincinatti side, heading east along the river through Anderson township?
Or Route 8, KY side, along the river, also east of Cincy.
Lots of bridges, some pedestrian only, to go back and forth from downtown, but Newport (KY side) and Cincy both don’t have a lot of bike lanes.
Try Caeser Creek State Park, north of cincy (like an hour?), I remember great swimming and running there. Probably biking too–and I remember they have a couple of tris there, so check online for the course routes. Probably pretty flat too.
Mt. Adams/Playhouse in the Park, which is the nicest yuppie part of the city, would be worth a spin, and you can head there from downtown/waterfront, where I think you can bike along the river… I can imagine you put together a scenic tour of the city + some of KY, with good hills, with some effort. It’s a surprisingly small city, btw.
Camp out? Hmmm… Caesar creek? Big Bone Lick State park, in KY, may have something.
Also check out http://www.cincinnaticycleclub.org/
They have some cue sheets.
BTW, be careful if you go more south in KY–while you’ll hit more rural areas, nice hills, good for biking, you’ll also run into the type of people that think cyclists could make good trophies…
–zee