Calling all bikers, scavenger hunters and, especially, bikers who are scavenger hunters. Bike Twin Cities, a nonprofit community organization, is holding a summerlong bike-based scavenger hunt.

Clues pointing to city landmarks are posted in businesses serving as check-in points. (They're listed on the website Follow the clues to one of the landmarks, take a photograph of you and your bike there and post it in your account.

Before summer is over, there will be clues to 50 landmarks; participants who post five or more photos by Aug. 31 will be entered into a drawing for prizes, including a new bike. There's no fee to register.

It's pretty easy, which is the point, said John Blaska, president of Minneapolis-based Everspring Health, main sponsor of the event.

"The reason for this is to get people out on regular bike rides," he said. "At the same time, we figured that we could remind them that there are some really neat places to bike here."

The family-friendly event takes place entirely on Minneapolis bike paths and parks, but there are plans to expand to St. Paul next summer. The website warns that if you end up in an area that is not conducive to biking, "you are looking in the wrong place."

Blaska admits that some of the clues are harder than others, in an effort to appeal to people who like to play games.

"But so far, we haven't seen anybody who's been really off" the mark, he said. "Most of the comments we're getting are about people having fun."