Questions & Answers about בסוף השבוע נסענו לחוף, אבל הים היה קר.
סוף השבוע is a very common Hebrew structure called the construct state. It is the compact Hebrew way to say the end of the week or weekend.
In this structure:
- the first noun is סוף = end
- the second noun is השבוע = the week
So סוף השבוע literally means end of the week.
You can say הסוף של השבוע, but it sounds more explicit and less natural here. Hebrew usually prefers the shorter construct form.