A jetski and foot race which was how i met your mother

I was taking part in a race. I started late but I didn't mind because I had done something which allowed me to stop only once instead of twice. The race started out as a jetski race, but then it turned into a running race. We went from the water up a hill to a cross roads then we started back at the beginning again but it wasn't the same beginning and we where now still on foot. We ran through a building with lots of corridors and then out the back, up a hill and we ended up at the same cross roads. I was in the lead. When we arrived at the cross roads we were told that we had to find two object which had been man made for the race. One was a big wooden path behind a big tree which was covered in chicken wire, so people wouldn't fall over - I fell over.. I think it then changed to a scene from 'How I met your mother', can't remember what happened though. Thats when I woke up...