If you are using it in a title.......... How I Spent My Summer Vacation.
The correct way to capitalize the title "How I Spent My Summer Vacation" is to capitalize the first letter of each word.
You would capitalize Baltimore by making the first letter of the word uppercase - "Baltimore."
You do not capitalize science fiction. If you look any word up in the dictionary, you will learn if it should be capitalized. The rule: Capitalize names of courses: Economics, Biology 101. (However, we would write: "I'm taking courses in biology and science fiction this summer.")
You would capitalize the next word after a comma if it is the start of a new sentence or if it is a proper noun.
Yes, you should capitalize proper nouns such as "Happy Holiday Season." This helps to distinguish them from regular words or phrases.
In a list, you would typically capitalize the first word of each item, proper nouns, and the first word after a colon if it introduces a complete sentence.
TTThe Barnes family spent their summer in south America.
Breckenrigde vaction or condo rentals for the summer can be found on some vacantion sites or on the FlipKey website where people can switch their houses for the vacation.
i whould take a vaction
he would go to washingtion state
You would have to buy sims 3 World Adventures.
Of course if u capitalize summer,spring,and Fall why don't u capitalize Winter 
I would capitalize all of them. Catch Me If You Can.
I prefer you go to Hainan, an island in southern China. It's warm and cheap. Have a nice vaction.
You would capitalize that word however you use it.
No, because its a continent but you would capitalize central america
In normal use, you would not capitalize it. It there are specific instances when it is used as a title that it would be correct to capitalize it. The Catholic Missionary Church was located in Nairobi.
Only if animal is proper noun. For instance, you would capitalize Chris Carter's nickname Animal and you would capitalize Animal from The Muppet Show. You wouldn't capitalize stuffed animal, it's not a proper noun.