Check out what is happening at the Melkweg during your stay. It is an excellent venue that hosts big concerts etc. (
www.melkweg.nl). There might be some bands on you like
The Spui area is host to a load of 'brown' style cafe bars. These are a great place to while away a few hours before dinner. Cafe Luxembourg and the big one on the corner (that I can't remember the name of) are good in the Spui area and serve an amazing array of beers.
Just off the Spui is my fave coffeeshop 'De Dampkring'. Good venue that serves beer and other things . Worth a visit just to see the crazy decor of the front of the shop.
The Spui is one of my fave areas in Amsterdam along with the Jordaan. Away from all the hustle and bustle of Centrum and a lot more local. A group of 11 of you may be better sticking to the main drag though as they tend to be more tolerant to huge groups of tourists around there.
Clubbing, I like the Arena club. Just outside of town centre and a bit picky on door policy so don't turn up in crap clothes. There are plenty of clubs in town, best to just get there and pick up some fliers/look out for posters to see what is happening while you are there and finding out if there are any DJ's you want to see.
There are lots of larger clubs around the Rembrantsplein and Leidseplein. It is a bit different to the UK in that nobody really goes out until around midnight. Everyone drinks at home first then hits a club. Like I say, depends what type of clubbing you are after. Arena is a good venue though for more underground dance stuff. Flyers and posters are the key though!
Have fun and stay safe!'