Feeling adventurous? Feeling wreckless? These are the sort of activities your bored-but-daring friends will egg you on to do and if everything goes to plan you'll have the time of your life. Here are a few mental activities you might be tempted to try out next time you are away from the office and looking for an adrenalin rush. But if you do, know this, your travel insurance probably won't cover it. Some of these activities are so extreme that should something go wrong and you did have coverage, it would be your next of kin doing it on your behalf!