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!

Tribal Style Bungee Jumping

Tribal Style Bungee Jumping: This tribe in Vanuatu certainly have developed their own unique and incredibly dangerous way of asking for a blessing for the crop of yams. Attached by vines, the jumper dive from a 100ft tall tower and is actually supposed to graze the ground with his head. In the tribal cultue, the jumper is allowed to say anything he wants to whomever he wants before he jumps and his words won't be held against him. This is one insane activity best left to the locals!

Caged Shark Diving

Caged Shark Diving: Watching video clips online is all fair and well, but would you get inside a cage to be dangled in the water as shark bait just inches away from jaws of death? If you had ever thought about trying a cage-assisted shark dive then this video will probably make you think again. They definitely didn't pay to get that close!

Human Slingshot

Human Slingshot: These adventurous French guys came up with the hair-brain idea to setup a slingshot between two cranes capable of catapulting them 100's of meters into the hair and parachuting back down. Just wait until you see this!

Canyon Swinging

Canyon Swinging: Drop 109m from the platform where you'll swing over the Shotover River. About 60m of the drop is free fall. Notice in the video how the professional staff casually chat to the jumper and then at the last moment pretend like there's a problem as they drop away! You can choose to fall out backwards if you you want.

Sky Diving

Sky Diving: There are lots of places around the world where you can go skydiving safely. Even though all first dives are tandems, I'd rather stay onboard the aircraft or just stay firmly earthbound. Check out this girl's experience where the reserve had to be pulled.

Base Jumping

Base Jumping: Thankfully very few people will ever seek out the opportunity to base jump. Base (Building Antenna Span Earth) jumping is definately beyond the danger levels of skydiving, primarily because you have so little time to deploy your parachute between jumping off and hitting the ground. If that isn't bad enough, base jumpers are particularly prone to winds blowing them back into the structure from which they jumped.

Spearfishing

Spearfishing: You'll need lungs like a whale to stay under long enough to snag a decent fish when you go spearfishing. Add to the mix, those pesky sharks who are drawn to the scent of blood from far and wide.

Zip Lines

Zip Lines: This zip Line in South Africa claims to be the world's fastest, highest, longest and steepest zip line. Looks like a lot of fun.

Extreme Bungee Jumps

Extreme Bungee Jumps: How about doing a bungee jump from the 61st floor of the Macau Tower, that's a drop of 233 meters. Get an appreciation of the height in this picture of the Macau Tower.

100ft Bridge Jump

100ft Bridge Jump: This is exactly the sort of fun which will end in tears and likely a trip to the ER with a plunctured ear drum. Mind you though, the two jumpers have quite a large female following!