Any decent mtn biker would have no problem. Throw in a teeter-totter and make it interesting...
Don't be too sure of that. While in Hawaii for a race, Tinker of Cannondale Race Team
http://www.tinkerjuarez.com/
managed to take a tumble into the Ali Wai Canal, and it has a decent sidewalk (which bicyclist are prohibited from using by the way).