Boulder! Yikes! We were hiking in Northern California once during the rainy season. And a section of trail along a steep ridge washed out while we were hiking! We had to do some dangerous scaling and climbing to get around that section on the way back. File this under things I would never consider now that I have children . . .

Another reason I don't like riding in high winds is the debris on the trail. A lot of little sticks and branches to fly up and break a derailleur.