General
Number of rooms in 3* hotels: 395
Number of rooms in 4* hotels: 992
Number of rooms in 5* hotels: 542
Distance from Amsterdam: 25 km
Distance from Schiphol: 25 km
Distance from Den Haag: 20 km
Distance from Rotterdam Airport: 40 km

City wide conventions
There are two 5* (conference)hotels within walking distance of one another:
Hotels van Oranje: 288 bedrooms, 50 meeting rooms
Grand Hotel Huis ter Duin: 254 bedrooms, 19 meeting rooms  

A 4* (congress)hotel in the direct vicinity of the above hotels:
NH Leeuwenhorst: 513 bedrooms, 120 meeting rooms

Location
Noordwijk is in the middle of the economic heart of the Netherlands, just off the highway and only 30 minutes from Amsterdam, 20 minutes from Schiphol International Airport and the Hague.