假期结束了

我女儿的假期结束了。她下个星期四上课。我们这几天一起度过了快乐的时光，比如：一起溜冰， 看了电影《STAND BY ME 哆啦A梦》,骑自行车，游泳，做饼干，看电视，看书，去博物院，跳舞，唱歌，画画，玩耍等等。 我现在累死了.
但是我很开心。我常常没有时间去好好的陪我的女儿。
今晚三王要在这里给孩子们礼物-在西班牙没有圣诞老人。今天下午三王要到港口。我们到港口会看到他们。我的女儿很兴奋。

My daughter’s holidays are finishing. On Thursday she goes back to school. These days we have spent some time together. We have gone ice skating, to the cinema(Doraemon Stand by me), cycling, swimming, made biscuits, watched TV, read books, gone roller skating, gone to a museum, danced, sung, painted, played, etc. I’m exhausted!
But I’m happy. I often don’t have free time, we can’t spend time together.
Tonight the 3 kings will bring presents to children- In Spain we don’t have Santa. This afternoon the Kings will arrive at the port. We will go to see them arrive. My daughter is very excited.

放假完了

我女儿的放假完了。-which means "her holiday has finished". To express "are finishing", you will need 我女儿的假期快完了/假期快结束了, or in a formal way 我女儿的假期即将结束.  放假完了 sounds odd, I would suggest 假期结束了. 我女儿放假了 is correct, but to express that her holiday ends, I would say 她放假结束了 rather than 放假完了. Or use the noun 假期, 她的假期结束了.

她下个星期四上课。Nice but to be more succinct, try 她下周四上课.

我们这几天一起花时间。这几天，我们都在一起。The literal translation would be 这几天，我们花时间在一起, but it sounds strange to me, as 花时间 actually indicates 在一起,thus leading to wordiness. 

我们去溜冰了， 看了电影《STAND BY ME 哆啦A梦》,骑自行车了，游泳了，做饼干了，看电视了，看书了，去了四轮溜冰，去博物院了，跳舞了，唱了，画画了，玩儿了， 等等。 我现在累死了.

Too many 了 cause wordiness too. Try:

我们去溜冰、看电影《哆啦A梦伴我同行》、骑自行车、游泳、做饼干、看电视、读书、滑冰、去博物馆、跳舞、唱歌、画画、各种玩。我现在累死了！

Putting 了 only in the last sentence can also emphasize that you are really exhausted. 四轮溜冰 sounds odd, just 滑旱冰, which means you skate not on the real ice, but on the ground, as the word 旱 means "dry".
但是我很开心。我常常没有时间， 我和女儿常常不可以一起花时间。 我常常没有自由时间，我们不能常呆在一起。
这里今晚三王给孩子们礼物-在西班牙没有圣诞老人。今天下午三王到港口。我们会去港口看到他们。我的女儿很兴奋。

今晚，三王会给孩子们礼物——在西班牙没有圣诞老人。今天下午，三王会到港口。我们会去港口看他们。

Will is translated into 会/将, 将 is more fomal language. 看到 may indicate the past tense.

My daughter’s holidays are finishing. On Thursday she goes back to school. These days we have spent some time together. We have gone ice skating, to the cinema(Doraemon Stand by me), cycling, swimming, made biscuits, watched TV, read books, gone roller skating, gone to a museum, danced, sung, painted, played, etc. I’m exhausted!
But I’m happy. I often don’t have free time, we can’t spend time together.
Tonight the 3 kings will bring presents to children- In Spain we don’t have Santa. This afternoon the Kings will arrive at the port. We will go to see them arrive. My daughter is very excited.

放假假期完了（or you can say 假期结束了）

我女儿的放假期完了。她下个星期四上课。我们这几天一起花时间我这几天花时间和她在一起(together)1。我们去溜冰了， 看了电影《STAND BY ME 哆啦A梦》,骑自行车了，游泳了，做饼干了，看电视了，看书了，去玩了四轮溜冰，去博物院了，跳舞了，唱歌了，画画了，玩儿了， 等等。 我现在累死了.
但是我很开心。我常常没有时间， 我和女儿常常不可以一起花时间。 我常常没有时间和女儿在一起。
这里今晚三王（三个国王）将会2给孩子们礼物-在西班牙没有圣诞老人。今天下午三王（三个国王）将会到港口。我们会去港口看到他们。我的女儿很兴奋。

My daughter’s holidays are finishing. On Thursday she goes back to school. These days we have spent some time together. We have gone ice skating, to the cinema(Doraemon Stand by me), cycling, swimming, made biscuits, watched TV, read books, gone roller skating, gone to a museum, danced, sung, painted, played, etc. I’m exhausted!
But I’m happy. I often don’t have free time, we can’t spend time together.
Tonight the 3 kings will bring presents to children- In Spain we don’t have Santa. This afternoon the Kings will arrive at the port. We will go to see them arrive. My daughter is very excited.

1. It is not natural to say "一起花时间". You can simply say "我（花时间）和她一起（做什么）"(I spend some time with her to do something), or 我们在一起（做什么）(we spend some time together to do something)

For example:

我这几天和她在一起。I spent these days with her.

我花时间和她一起去游泳。I spent some time with her to swim.

2. Chinese doesn't have time tense, so you have to add adverbs or other words to make sure readers know these things will happen in future.

Very good job!