昨天真是一个完美的日子！

(I would like the Chinese to sound as casual as the English, please)

我昨天跟Patrick玩得很开心。我们坐公共汽车到Guildford，然后给小鸭子吃喂了一些面包，再去了电影院看了3D版《Step Up 5 "All in" 》3D版。这是我第一次看一部3D电影，依我看←（too formal）我觉得3D电影真的很酷！嗯，当东西从银幕里向我飞出来时，我低下了头，特别当更别说那个东西是打碎的玻璃碎玻璃了。我真的没想到会这样做，lol 哈哈（其实Patrick觉得我的反应很搞笑, I might add）。不出所料，这是一个部非常好看的电影，有着非常棒的了不起的舞蹈。我们吃了nachos辣炸玉米片， 爆玉米花，糖果，还喝了一些带气汽的雪泥饮料。我们还拥抱了很多次。因为他的肚子已经很饱胀，所以我们没出去吃饭。昨天真是一个完美的日子！

Had such a great day with Patrick, today.We took the bus to Guildford, fed the baby ducks, and then went to the cinema. We saw Step Up 5 "All in" in 3D. This was my first experience of 3D cinema, and I must say it was pretty cool! Yes, I did duck the first couple of times things came flying out the screen at me, esp the broken glass, hadn't expected that, lol (Patrick found my reaction hysterical, I might add) Excellent film, awesome dance moves, as always.We had nachos, popcorn, sweets, some fizzy slush drink, and lots of hugs. We didn't do dinner as his belly wouldn't hold any more food! Perfect day!
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Correcting from the nuance of your original and as requested in a very casual manner.

昨天真是一个完美的日子！

(I would like the Chinese to sound as casual as the English, please)

我昨天, 跟Patrick玩得真很开心啊。我们搭巴士坐公共汽车到Guildford，然后喂了给小鸭子吃了一些面包后，我们就再去看一部3D[立体]版了电影, 叫着院看《Step Up 5 "All in" 》3D版。这是我第一次看一部3D电影的，依我看，3D电影真是太的很「酷」了！嗯，当东西从银幕向我飞出来时，我有几次我要低下了头来避银幕中飞出來的東西，尤其是破特别当那个东西是打碎的玻璃。真出我意料啊我真的没想到会这样做，lol （我要說說, Patrick觉得我的反应太狂 or use the loanword, 「歇斯底里」很搞笑, I might add）。不出所料，这场是一个非常好看的电影太好了，了不起的舞蹈动, 霹雳一流[or 真棒]。我们我们有吃了nachos， 爆玉米花，糖果，和还喝了一些带气的雪泥饮料. 我们兩人还有很多的抱抱啊. 最后, 晚餐也/略过/沒吃/ 了, 是因为他的 我们拥抱了很多次。因为他的肚子已经沒空了很饱胀，所以我们没出去吃饭。昨天真是一真是个完美的一天日子！

Had such a great day with Patrick, today.We took the bus to Guildford, fed the baby ducks, and then went to the cinema. We saw Step Up 5 "All in" in 3D. This was my first experience of 3D cinema, and I must say it was pretty cool! Yes, I did duck the first couple of times things came flying out the screen at me, esp the broken glass, hadn't expected that, lol (Patrick found my reaction hysterical, I might add) Excellent film, awesome dance moves, as always.We had nachos, popcorn, sweets, some fizzy slush drink, and lots of hugs. We didn't do dinner as his belly wouldn't hold any more food! Perfect day!
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完美的一天

(I would like the Chinese to sound as casual as the English, please)

昨天跟Patrick玩得很开心。我们先坐公交到Guildford，给小鸭子喂面包，然后去看《Step Up 5 "All in" 》3D版。我第一次看3D电影，3D真的很酷！嗯，逼真啊! 我在座位上左闪右避， 要避过那些从银幕飞过来的东西，特别是玻璃碎片。想都没想过会这样，lol （Patrick觉得我的反应很搞笑, I might add）。不出所料，是非常好看的电影，舞蹈尤其精彩。我们吃了零食一大堆，nachos， 爆玉米花，糖果，还喝了带气的雪泥饮料。我们多次拥抱。他吃零食已经吃得很饱，所以我们没去吃饭。真是完美的一天！

Beth, this.makes it much more akin to the tone of the English original.