I'm having a great time in Shanghai.
我在上海的玩的很愉快。

have a good/great/wonderful time (in)
(在...)過的很愉快
I wish you have a great time during your summer holiday in Hawaii.
祝你在夏威夷度過一個愉快的暑假。
They are all very kind and I had a great time last night.
他們都非常友好，昨晚我玩的很開心。

A:Hey,Michelle,this is my friend James.He's visiting Shanghai from New York.
米歇爾，這是我的朋友，詹姆斯，他從紐約來上海找我。
B:Hi James.Nice to meet you.So,uh,are you visiting for business or pleasure?
你好，詹姆斯。很高興見到你。那你來這兒是工作還是游玩？
A:Well,actually a little of both.I'm meeting some business contacts but I'm also taking some Mandarin classes.
恩，實際上兩個目的都有。我來這兒處理一些生意上的事情。同時我還報了普通話班。
B:That's cool.How's it going?
真棒，現(xiàn)在進(jìn)行的怎么樣？
A:Well,I'm finding the classes pretty tough actually,but I'm having a great time in Shanghai.It's really an amazing city.
事實上我發(fā)現(xiàn)，學(xué)習(xí)的內(nèi)容比較難。但是我在上海的玩的很愉快。上海真的是個了不起的城市。
B:It sure it.Are you staying for long?
當(dāng)然。你要在這兒待很久嗎？
A:Only two weeks unfortunately.I wish I could stay longer but.
有點遺憾的說，只有兩個星期。我多希望可以待的久一點。
B:Well,listen,if you need someone to show you the sights then just call me.I'm having a little get-together at my new apartment next week.So you can drop by then if you have time then.
如果你想游玩需要有人給你當(dāng)導(dǎo)游 ，就打電話給我。下周在我新的公寓有個小聚會。如果那個時候你有時間，可以過來玩玩。
A:That sounds great.I'd love to.Let me take down your number,Michelle.
聽起來不錯，我想我會去的。米歇爾，能告訴我你的手機(jī)號碼嗎？