Take the train to Utrecht CS. For more details about taking the train see the NS timetable. Then you take the bus to the institute. Bus 11 (stop Botanische Tuin) or 12 (stop Padualaan) to De Uithof.
By car
From Amsterdam drivinag on the A2 motorway south: Motorway A2; exit "Utrecht Noord" National road N230 to join with A27 Motorway A27; at crossing "Rijnsweerd" direction "De Uithof" Motorway A28; first exit "De Uithof"
From The Hague and from Arnhem, driving on the A12 motorway east: Motorway A12; at crossing "Lunetten" direction Amersfoort Motorway A27; at crossing "Rijnsweerd" direction "De Uithof" Motorway A28; first exit "De Uithof"
From Hilversum or Breda, driving on the A27 motorway south: Motorway A27; at crossing "Rijnsweerd" direction "De Uithof" Motorway A28; first exit "De Uithof"
From Amersfoort, driving on the A28 motorway west: Motorway A28; exit "De Uithof"
From Den Bosch and Eindhoven, driving on the A2 motorway north: Motorway A2; at crossing "Oudenrijn" direction Amersfoort Motorway A27; at crossing "Lunetten" direction Amersfoort Motorway A28; first exit "De Uithof"