If time is short and you want to see a lot of Rotterdam, we advise you to travel by public transport. Especially the tram and metro can be a fast way to travel through the city.
A day ticket of about € 8,00 will allow you to travel 24 hours within the Rotterdam area, using metro's, tram's, and buses of the Rotterdam transport company RET.
In The Netherlands, we use a travel card called ‘OV-chipcard’. This card automatically calculates the right fare and is accepted at all major transport companies. For every journey, you'll have to 'check-in' and 'check-out' with the card. We explain the OV-chipcard here.