Thank you all! I try to re-write it with your suggestions, just so that I have to think about each meaning again. I guess it will be pretty close to one of your translations in the end... :)

2011-11-03 - 游戏时间

我喜欢组织“定向游戏”。你可以利用全城市玩游戏。例如在玩“早上结束的旅程”[how about this, @80mdkw?]，你需要找到六个检查站，和每次完成一个任务。你在夜间奔跑，当猎者寻找你。常有几百名年轻人参与。 

(There are so many possibilities to say something... for example, what is the difference between 譬如，比如，例如？)

I think the game you are referring to is named "定向游戏" cuz I've ever played this game before. It's like doing quests in MMORPG by yourself in the real world. Not sure what task name it is in English when you said "到晚上结束的旅程". I would write:

2011-11-03 - 游戏时间

我喜欢组织“定向游戏”，游戏过程中，你可以利用城市资源。比如，有一个游戏叫“到晚上结束的旅程”，你需要找到六个检查站，然后完成一个任务。为了完成任务，在你黑夜里要到处跑，还有人”寻猎“你。一般需要几百个年轻人参与。

详情请见:

http://totheendofthenight.com/
http://totheendofthenight.com/gallery

Although I think no more than one hundred people is just enough to run the game:)

2011-11-03 - 玩耍时间[玩耍的主语一般是小孩子，用在这里不合适， 建议你用“娱乐”或“狂欢”]

我喜欢主办路[我不清楚你想说什么，如果加动词,你用"参加"比较好]街头游戏 。你可以利用[利用=make use of 我感觉这里用“在”比较好 ]全市玩耍。
例如在玩耍[玩耍不接宾语]“到晚上结束[I can't translate "to the end of night"exactly but I think it means "late at night".But 晚上结束 means "It will be end when night comes"]的旅程”，要寻找的六个检查站，和解决一个的任务。你在夜间奔赴奔跑奔赴“的宾语一般与战争有关，如”奔赴战场“，”奔赴前线“]，当猎者寻找你。常有几百名年轻人参与。 

见：http://totheendofthenight.com/
和：http://totheendofthenight.com/gallery

2011-11-03 - 玩耍时间

我喜欢主办玩路街头游戏 。你可以利用全市玩耍。
例如在玩耍“到晚上结束的旅程”，要寻找的六找到六个检查站，和解决一个的任务。你在夜间奔赴跑，当猎者寻找你的时候。这个游戏常往往是/常常是几百个年轻人参与。

见：http://totheendofthenight.com/
和：http://totheendofthenight.com/gallery