The electric field that would throw them back on the roof is what prevents tributes from jumping. This is probably placed so that none of the tributes can commit suicide or escape before, or during, the games. The Capitol doesn't want tributes to die before the games so they can watch them die for entertainment, or need to get another tribute last minute.
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In the Hunger Games series, tributes learn the fates of other tributes through a combination of personal observation, the Capitol's orchestrated events, and the Gamemakers' announcements. Tributes can witness the deaths of others firsthand during the Games, or they may receive information through sponsor gifts or televised broadcasts. Additionally, the Gamemakers can manipulate the environment to display the status of different tributes, such as through the cannon signaling a fallen tribute or the faces in the sky showing the fallen tributes at night.
Career tributes are tributes from Districts 1 and 2 (and 4 in the book, but not in the movie) They have trained for the games their whole lives, even though it is illegal, however they are favoured by the Capitol and so are not punished. The fact they have trained gives them the upper hand and so they usually win. They wait until they are 17 or 18 and then volunteer at the Reapings as they have a very high chance of winning the games. They are a threat to the other, less well-off tributes as they have skills that they have perfected over many years.
He did go bungee jumping in New Zealand
In each game each district must send in a girl and boy to represent them. Seeing there are 12 districts there are 24 tributes. the 24 tributes must battle each other off til ONE is left standing taking home everything you could ever want.
Donnie Hathaway commited suicide by jumping off of the 39th story building of his Apartment.