Disclamer

Mbrewer and other contributors are not professional guides. This blog consists of information spread for other's benefit. It has no guarantees of correctness, or accuracy. No review process, etc. Any activity you may take part in is your own responsibility and we take no responsibility for inspiration or ideas that may cause harm.

Now that out of the way.
Seriously, a lot of these activities are fundamentally dangerous. Most of the things we do can be done in relative safely if done carefully, or at least we think so. Be careful, know your limits, and have a backout plan when you push those limits. Most people can do more than they think they can, but counting on that is called "stupid". Have fun, and stay the right amount of safe for you.