Request assistance (Antwerp)

Good evening friends,
i need a little information here, my family is visiting me here for summer vacations and i need to show them around.

How i can organize a suitable and most economical euro trip for them.

Two constraints to consider;

- I have reasonable but limited budget.
- I am not allowed to drive here.
- I have to show them around during weekends as i am left with no holidays.

Suggestions appreciated.

Regards