It's a really popular destination.

这是一个非常受人欢迎的目的地。

A: Beijing's packed with tourists now.

A: 北京现在到处都是旅游的人。

B: Yes, I guess it's a really popular destination nowadays.

B: 是的，我想现在它是一个非常受人欢迎的目的地。

A: Look at this – the hotel is full of tourists.

A: 看这——这家旅馆全是游客。

B: What language are they speaking? I can't understand what they're speaking.

B: 他们在讲什么语言？我不明白他们在说什么。

A: I'm not sure.  It might be French or Spanish.  I'm not really sure.

A: 我不知道。可能是法语或者西班牙语。我不十分肯定。

B: I think they're all European, from France and Spain, maybe Italy and Germany too.

B: 我想他们是欧洲人，从法国和西班牙来，也可能是从意大利或者德国来。

Notes 注释

1. You can talk about a place in terms of tourism by using popular / popular, eg Beijing is a popular tourist destination now / Beijing is a popular tourist destination now.
你可以用popular / 受人欢迎的来谈论某地的旅游状况。例如：Beijing is a popular tourist destination now /北京现在是个旅游的胜地。

2. Again, remember the distinction¹ between the country or place name and the nationality² (or language): France / French: France/French; Spain / Spanish: Spain / Spanish: Germany / German: Germany / German and Europe / European: Europe / European.
再一次，请记住国名或者地名与国籍（或者语言）之间的区别：France / French: 法国/法语（法国的）; Spain / Spanish:西班牙 / 西班牙语: Germany / German: 德国/ 德语以及Europe / European: 欧洲/ 欧洲人。