2012年2月29日

下个星期，我就要开始我的寒假生活。我非常兴奋啊。我们全家将去海边度假为了庆祝我妈妈的生日。

2012年2月29日

下个星期是我的春假。我非常兴奋啊。我們全家去海边！我们庆祝我妈妈的生日。

enjoy ! :)

2012年2月29日

下个星期是我的春假。我非常兴奋啊。我家去海边！我们庆祝我妈妈的生日。

“春假”是什么意思呢？嘿嘿·····如果是春节假期，在汉语中我们一般说：”年假“。

下面的句子应该是：为了庆祝我妈妈的生日，我们家人打算去海边度假。

下个星期就放春假啦！！好兴奋啊！！我们全家都会去海边庆祝我妈妈的生日。

There is almost no grammar mistake in your sentences at all. Really good job! It's just a little different with how Chinese express their feeling. "下个星期是我的春假"，it's right. But Chinese don't usually talk in this way. I think it might be better to emphasize I in the first sentence. Like 下个星期我放春假. Or I feel 下个星期就是我的春假了 is better, but I cannot tell why.... Maybe 下个星期是我的春假 sounds too  rigid to me. 我非常兴奋啊 I think Chinese rarely say it too. It sounds a little weird, but only very very little weird. I cannot tell the different, but I would prefer 我非常兴奋 or 我好兴奋啊. 我家去海边 I think this sentence has a little grammar problem. 我家 is not totally the same with my family. I think it emphasize a little bit on the house you live, compared to "my family". But 我们全家 is just the people. And the last sentence is totally fine.