For beach lovers,  as of last weekend, there is a new park+beach service  at  central station.   They   can park their vehicle in  the Q-Park New Babylon car park  next to Central Station  and then take tram 9  to reach Scheveningen.

Park+Beach can be booked on Friday night from 18:00 and the entire day on  Saturday and Sunday via the website 

The cost is €5 per vehicle for parking and a return tram ticket. Each addition passenger costs €1.