dream fragment

Had a bad sleep last night, and only can remember one dream, and only part of it at that:

I was at the school retreat that's happening next week. I had finished eating lunch, and now we were all going to have a race. Me and a few other people got on dirtbikes, and lined up at the start. There was no one there to say go, but we all knew somehow when to start. It was a sandy path, and I was in first place until I go to a hill. I hit a rut at the base of the hill, and it knocked me over. I got back on the bike and gave it as much gas as I possibly could. I couldn't go up the hill, though. I was going too fast, and my tires were just spinning in the dirt. Someone shouted at me that I had to go slowly up the hill, but no matter what I tried, I couldn't get up the hill. Very frustrating. That's basically the whole dream at this point, but I remember very vividly the details of my surroundings. The path was about 10 yards wide, and there was about 3 yards of grass on either side for spectators to watch. Surrounding the grass and the path was a huge lake, and it seemed that over the hill I would have just driven into the water, so I was very curious about the other side of the hill. But I never made it over the hill.