I was in Amsterdam back in May and went to Keukenhof, still haven't got round to post about that!! It was a very nice visit, but like you say quite a tourist trap Denise!
The only other city I've been is Rotterdam, maybe I'll try to get out a bit more in future since the Netherlands is pretty close to UK and they have such a good public transport system.
I just google Soesterberg, were you/your family in the forces? That's the first thing that comes up on Wiki.