Your Chinese is already pretty good！Congratulation！I can understand your meaning and your minor mistakes gives me some possible imaginations. Let me tell you some points, ok？ 1. 天气常常很晴天。If I were you, I will rephrase it as 天气常常很晴朗。That means There are akways sunny days. 2. 我最喜欢的浆果是草莓因为太天甜和香了。 First of all, thare is a comma missing between 草莓and 因为, that would make the sentense clear. Secondly, by 天甜, I guess you mean "sweet", which is 甜 in Chinese. Since 天 and 甜 has the same pronunciation but in different tone, so it is easy to mess it up. Thirdly, as a native speaker, I will say the sentence like this:我最喜欢的浆果是草莓，因为它又甜又香。Adding 它 in the sentence makes the pointing clearly, and the pattern of又……又 makes it fluently. It is quite similar to "not only……but also". 3. Your last sentence confuses me. I guess you're trying to say that you can go out to swim, and you learn how to speak a foreign language. You have time to paint and read. Of course, if my guessing is wrong, please let me know so I can answer you question better. So based on my guessing, the sentence should be 我会游泳，我学外语，画画儿和看书。Don't forget the 和, that's "and" in Chinese, and when listing three things, we put 和 in front of the third item.It's quite similar to the usage of "and". So that's all my opinions. I have seen many answers below, they all have great points. Hope you learn well and have fun！

我觉得涛的回答很好了，解释的很好。但是我想补充一点，浆果这个词，可能是外国人喜欢说，在中国就说水果，我记得好像浆果这个统称里面还包含蔬菜类的东西。另外，坚果是另一大类。

我喜欢夏季。天气常常很好。夏季我能吃浆果。我最喜欢的浆果是草莓因为太甜和太香了。夏天我跟我的奶奶住。我会游泳，学许多的外语，画画儿，看书。

不错哦！你的中文还可以更大程度的提升！

我喜欢夏季。（总起句）（补充：因为夏天；补充原因：加上原因会更加通顺）的天气常常很（更正：都是；修改原因：很不能修饰名词，只能修饰形容词）晴天。夏季我能（更改：能）吃浆果。我最喜欢的浆果是草莓，因为太天甜和香（改正：因为太香甜；修改原因：词语使用不当）了。夏季（补充：的时候）我（补充：会）跟我的奶奶住。（补充：在夏天）我会游泳就许多学外语（修改：我会游泳，学习外语），画画儿，看书，（补充：我最喜欢夏天了！修改原因：承上启下，让全文更加完整） 修改后：我喜欢夏季。因为夏天的天气常常是晴天。而且夏季我能吃到我最喜欢的浆果：草莓，因为它太香甜了。夏季的时候我会跟我的奶奶住在一块。在夏天我还会游泳，学习外语，画画儿，看书。我太喜欢夏天了！