I feel released and placid. For 'release' you might mean 'free.' A common saying is 'free and easy,' this might be what you are looking for, perhaps 'peaceful,' but I think you already used this word ...

I feel great warm love from her. Here you can say 'I feel her warmth.'

Beautiful entry. It sounds like a lovely place to visit.

May 11th 2014 Going out on a rainy day

It has been raining for a week in southern China. The air here is very damp (humid? which one is better? Either 'The air is very damp' or 'It is very humid here' make sense, but people would normally say 'humid') and the roads are wet, but the temperature is comfortable and pleasant. That is why I like rainy days: cool weather, fresh air, wet green leaves, and clear and peaceful feeling (a sense of serenity?) (1)
Even when it rains heavily I still want to go outside and see another side of this new city. Holding an umbrella and slowly walking in the streets, I feel released and placid. Chophouses along the street are small, but food is more delicious than I expected. The fried rice noodles with minced pork and egg taste like the ones in my hometown, and it is nice with some chili sauce. After I finished the meal, I took a bus to continue my “rainy day trip”. To my surprise, many beautiful villages and parks are located in this city. Small mountains are well protected,but is would be be better if some animals lived in them. Everywhere is green.
Last but not least, I made a call to my mother. Even though it was a short conversation,  I felt warm love from her. (I felt loved by her, I felt love between us)
It is late in China, good night everybody.
1.clear and peaceful feeling：I don't know how to make it more clear, what I want to say is my thinking is clear and I don't feel dizzy, and my mood is peaceful.maybe you could help me with the expression.

This is very advanced English! Well done :)

May 11th 2014 Go out in a raining day

It has been raining for a week in southern China. The air here is very humid.  Roads are wet, but the temperature is comfortable and pleasant. This is why I like rainy days (or a rainy day): cool weather, fresh air, wet green leaves, and a clear and peaceful feeling. (1)
Even it rains heavily, I still want to go outside and see another side of this new city. Holding an umbrella and slowly walking in the streets, I feel released and placid. Chophouses along the street are small, but food is more delicious than I expected. Fried rice noodle with minced pork and egg tastes like the one in my hometown, and it is nice with some chili sauce. After I finished the meal, I took a bus to continue my “rainy day trip”. To my surprise, many beautiful villages and parks are located in this city. Small mountains are protected well, but it would be be better with some animals living in there. Everywhere there is greenery.  (or you could say "Everywhere is green." instead.)
Last but not least, I made a call to my mother. Even though it was a short talking, I feel great warm love from her.
It is late in China.  Good night everybody.

1.clear and peaceful feeling：I don't know how to make it more clear, what I want to say is my thinking is clear and I don't feel dizzy, and my mood is peaceful.maybe you could help me with the expression.

Regarding (1), you could instead say, "serene feeling."

Excellent job overall, Vivian.