stag do ideas

Hi,

I am organising a stag do for 11 people in their 30s in Rotterdam in June, 5-7 June.

I don't know any of the people going apart from the stag and was told to do Rotterdam, so have a very open brief. I just know the people going are outgoing, up for a laugh etc.

I am very much open to fun suggestions, so if anyone has any good suggestions they are greatly appreciated!

We have

Friday Daytime (people arriving throughout the day)
Friday Evening
Saturday Daytime
Saturday Evening
Sunday daytime (waiting for flight)

Thanks in advance!