One of your first stops should be FutureLand. Here, you'll be able to orient yourself and pick up some great ideas before you begin exploring.
This tourist information center in Maasvlakte comes recommended by many travelers, so put it on your travel plans. Don't stop there, though. There are a lot more spots ready for you to enjoy after FutureLand. Hoek van Holland Beach, and Dutch Coastal Defense Museum are close by.