Avoidance is better than cure

Pre-, during and post-ride tips

Be safe when fixing things

Don't just jump into a repair - check for general safety, check people, then check bikes. 

If you can't ride out...

Sometimes the bike really is trashed, or someone is injured too badly.  

Tools to take with you

What you should take, and what to use instead if you didn't take it.

Other stuff to carry

Like a good boy scout, be prepared.