I would perform a slow, on glide speed, and coordinated type turn. 6k is sufficient alt for a 180 but I have no idea in your situation where the airport is(ie how far away). I took a student(mature, really smart, and good stick/rudder guy) up on a flight to test just this question. Got permission from tower and took off from a parallel runway. At 600'(btw I had another area to land just in case something did go wrong) I idled the engine and made it back to the other parallel. We actually had to use flaps to lose altitude and thought about the possibility of making it back to the original runway.
Results may vary.