The Detour is the synchonized swimming, or a crime scene simulation that you see in the new preview on the website. The picture I found on Twitter shows a sign with the Detour options, "Analyze" or "Synchronize", and when I asked the poster for more information she said one was at the pool, and the other looked like a game of "Clue".
Also in that clip, by the way, Kristin apparently recovered during the flight because she's no longer on crutches. And Brian & Cynthia say in a confessional that they didn't tell anyone they're police officers. At the latter task, Brian says to Kristin "We don't know anything about policing. I hope we don't mess this up! (wink to the camera)"