I had the idea that this short essay should be in the first person plural ("we") because it talks about personal feelings such as thrills and fears.
Most of people like adventures firstly because of adrenaline and exciting situations. Some of most popular adrelinine sports are river rafting, rock climbing and parachute jump. Some of them are at first time very scared (from obvious reasons, they first think on the worst - death), but as they repeat whole "process" (ex. parachute jump) they start to enjoy much more, but there is no fear at all.
Excitement and danger give us an adrenaline rush, and sometimes we deliberately give ourselves that rush by seeking high-risk adventures. The first time we do them, sports such as white-water rafting, rock climbing, and skydiving are wildly alarming (think "death-defying.") But they become less fearsome and more enjoyable the more we do them.
After that"initial" process, most of them simply start to love some adrenaline sport and they do it because of enjoyment and hanging out with people with same interests.
Even after the adrenaline-inducing thrill wears off, we may still keep at it because we love the sport and like hanging out with others who share our enthusiasm.
One of most dangerous situation is when people do some small "adventure" only because they want to prove themselves to other ones. They come unprepared and full of confidence, which isn't so good in all that dangerous advantures and sports. Situations like that end with tragic end.
But these madcap sports can be dangerous. Some of us try them on a dare, or to show off, or to prove something to ourselves and others. Others of us may find that the fastest route to a tragic outcome is to show up underprepared and overconfident.
Everybody like to do some adventures, because "life is only one" - some are opsessed with them, they are always in move, full of adrenaline and new impressions and they never get bored. Some do it sometimes, because somebody persuaded them and last ones never do it because they are too scared.
We all have just a single life. Experiencing thrilling adventures and pitting ourselves against life's scariest risks are ways to get more out of life. In fact, some of us become addicted to adrenaline and obsessed with thrill-seeking, forever hunting for new impressions to stave off boredom. Others of us enjoy an occasional adrenaline charge from a scary adventure.
Of course, the rest of us are a little too scared to try it at all.