Great thread. One thing I can agree with is DON'T RIDE ALONE. It's asking for trouble. And bring tools.
A friend, my brother, and myself were riding at Hudson lake. I had my 08 KLR, Friend Ray had his 09 KLR, Brother Sean had his 09 DR650. He tried to skirt the DR650 around a mud hole, and the back tire slid in, dropped the bike - and it turned out to be a mudhole that would stop a lifted jeep. Only thing sticking out of the hole was his handlebar, rest of the bike was submerged. We got it pulled out of the hole, and then the fun began - would it start? Pulled the plug, cranked it. Tipped the bike over on it's left side, stood it back up, and drained the water from the tank. Drained the fuel and water out of the carb. I ran the KLR out of the woods and to the closest gas station for three quarts of oil, and we drained the oil. Only ill effects seemed to be the clutch cable sticking, and my brother swearing off trail riding.