This is the only 'warning or danger' tip I could think of for such a friendly, safe and enjoyable place!
Iowa City is the only place I have ever seen 'parking tickets' for bikes.
There are plenty of bike racks dotted around downtown: biking is quite popular in the city. But if you leave your bike in the rack for too long (more than a day or so, perhaps?) you might find that a super-keen ?traffic officer? has attached an orange ticket to it. The ticket says, basically 'Move your bike within 2 days or we'll move it for you (and dispose of it)'.
So be warned: don't leave your bike in any IC bike rack for too long!
And make sure you a) don't ride your bike, skateboard or rollerblade in those streets where it is forbidden (e.g.the 'ped mall') and b) don't lock your bike to anything other than a bike rack. That's not allowed either...you may return to find your bike removed.
During the past year there have been 20 or more assaults in the downtown area of Iowa City.
It ranges from reaching up underneath a woman's skirt to armed robbery. Most of the criminal activity occurs in the early morning hours.
Walk with other people and stay where there is good lighting. Hopefully they will catch the 2 or 3 people who are involved.
If you are in Iowa City on a Saturday and there is a home Hawkeye football game - beware of the traffic.
Stay away from Kinnick Stadium unless you like sitting in traffic!
Also, if you are going to the University of Iowa Hospitals and Clinics, you are just across the street from Kinnick Stadium. Keep that in mind when you plan your trip.
University Heights is a small town right in the middle of Iowa City. They don't really seem to have any other income for their police force other than speeding tickets. Don't speed at all. Especially coming down the hill on Melrose Ave.
Often when out of town drivers come to Mercy Hospital or the Mercy Medical Center for doctor's appointments, they come down Jefferson Street traveling eastbound. Upon arriving in front of the 500 block, they read a sign that says "Mercy Parking" pointing to the left. So naturally the motorist turns left and promptly has an auto accident because he forgets he is on a ONE WAY Street! And he's making the turn from the right lane instead of the left one. So be forewarned! It's the most common accident in Iowa City.