日记，二零一一年七月五号， 晴朗

我喜欢听爵士乐和古典音乐。
我爱音乐。
我喜欢在树林l里面跑步和在沙滩远足。
我每天早上必须喝一杯咖啡。
我的工作太多了。
我爱看日落和日出。

日记，二零一一年七月五号  星期二( we also write what day it is at the top) 晴朗

我喜欢听爵士乐和古典音乐。
我爱文化。 ( this sentence is perfect grammatically, but it seems to be a little strange to say so here. By" 文化"we mean culture  or even civilization, it's a very general idea. You can say, "我爱中国文化"or "我爱世界文化"to make it more specific~)
我喜欢在树林跑步和，去（ you have used ”在" in your previous sentence, so here we could use another word to make it various)沙漠远足， 看日出日落(these are your hobbies related to outdoor activities so you'd better put them together。) 
早上必须喝一杯咖啡。
我工作太多了。 因为工作繁忙， 我早上必须喝一杯咖啡以保持清醒。（if I understand you correctly, these two sentence may have some kind of relationship, do you mean that you have to drink a cup of coffee to help you to keep a level head becuase of you heavy work? If so, just combine these two simple sentences into a complex one will make you writing more advanced:)

我爱看日落和日出

again, here words in yellow are some corrections and word in blue are reasons or suggestion.

~ In addtion, here i'd like to introduce you another new adjective, 繁忙（words in purple) means busy. and we often use it to describe busy works~

hope these could help~ I can see your progress everytime and I believe you will do better and better :)加油哦~

日记，二零一一年七月五号， 晴朗

我喜欢听爵士乐和古典音乐。
我热爱文化。
我喜欢在树林跑步和，在沙漠远足。
早上必须喝一杯咖啡。
我工作太很多了。
我爱看日落和日出。