MC Dave - perhaps I`m being harsh.
If you`re looking for a million + people lining the route, forget it.
I suppose what I`m trying to say is that if you run NY, Chicago, Berlin or London, you feel that the whole city gives itself over to the marathon for the weekend. Amsterdam is not like that. It is, however, welcoming and quite atmospheric in its own way. I did it back in 2007 and really enjoyed it and would have no hesitation in recommending it.
There are a reasonable number of spectators - at least in the city sections and Amsterdam is a warm and friendly place.
With regard to the river section - it is pretty quiet but lots of people like it because it`s quite scenic. The industrial estate is a bit grim but it`s a very short section.
It`s definitely a fast course. It`s right up there with Chicago or Berlin (unless there`s a stiff breeze along the Amstel).
Amanda - re hotels: there may be a couple of conferences going on but there are so many hotels that I can`t imagine you will have any difficulty finding somewhere, were you to look in April. Amsterdam must have tens of thousands of tourists at any one time - throughout the year. I can`t see a couple of conferences having a huge impact - especially if you aim for the smaller/less well known establishments.
Edited: 24/02/2012 at 09:37