You have a bit of a problem with tenses here. You are mostly talking in the present tense, but you are not talking about something that you ARE doing, but rather something that you WOULD do. You therefore need to express it using verb forms that are closer to the condizionale in Italian.

My Perfect Day

You would normally capitalise each word in a title in English.

The comma is not essential, but it's desirable to break up the sentence. The brief pause tells the listener that you are about to say one thing in a list of things.

I would get up not too early, about 7.

This is what I mean. "I get up not too early" would be better used to describe something that you do habitually. In this case it is describing what you would do on your perfect day so you would use a form closer to "mi alzerei" (more or less). It's still slightly awkward though; "I wouldn't get up too early; about 7" would be better.

I would have a big brekfast breakfast.

Then I would take a long and funny bike trip with friends.

You didn't have a verb in this sentence. "would take" completes the sentence.

After, when I come back at home, about 12.30, I have a shower and I eat a delicious lunch with my family.

You don't "come back at home"; you can "come home", you can "come back" (if you have previously said where you are coming back to) or you can "return home". However you are always returning to a place, not at a place. (As a rough guide, when you see "to" think "vado". When you see "at", think "sto", though in this case you don't need either of them.) I would rewrite this as:

After I return home at about 12:30, I would have a shower and eat a delicious meal with my family.

(The "at" that I used here obviously refers to the time, not the place.) Note that I dropped the second "I" as well; it's not wrong but you don't need it and it makes the sentence sound a little awkward.

In the afternoon I would rest and I watch TV or I read a book.

Again, you don't need the repeated "I"s. The first one carries over to the remaining actions.

In the evening I would go out for a pizza with my wife, and maybe with friends.
Unfortunatly Unfortunately only it it only happens once o or twice a year.

"Only" is an adverb; it modifies the verb "happens" in this case so it needs to be "it only happens" instead of "only it happens". The "o" I think is just a slip of Italian. In English it is always "or" rather than "o" or "oppure".

My perfect day

[The I's that I have removed are only to make the sentences sound more natural, technically there is no error with how they originally were]

My perfect day