Restaurant 1

There is a small restaurant downtown that is open all week. If you want to have lunch or dinner there you have to pay attention to the different availability during the week. In fact if you know the amount of sales, you will understand that the best day to eat something there for lunch, without too much of a crowd, is on Sunday. The same thing if you want to have a relaxing dinner you definitely should try on Sunday.

(a couple of sentences here sound a little odd in English but still make sense. E.g. 'pay attention to the different availability' could just be 'check availability'. Also 'if you know the amount of sales'. You're more likely to say something like 'if you know how busy it gets'.