Whatever you want to know about Amsterdam, ask me. I'm Dutch and I actually lived in (or at least extremely near) Amsterdam.
What I would certainly recommend is Boom Chicago! These are a bunch of American/European comedians that have their own theatre at the Leidseplein. I found them extremely funny. It is a good mix between American humor and the European humor.
Also, I would urge you to go and see the Albert Cuyp market. This is the largest market in the Netherlands and you can buy virtually anything there. The market is over 2kms long, which is much more than one mile. If you like Italian icecream (who doesn't??) you should visit Gelateria Peppino. It is run by one of those really proud Italians making 22 flavors of ice cream fresh every single day.
If you like clubs and cafes the 2 places to visit are the Leidseplein and the Rembrandtplein, there will be certainly something for you there.
If you have any more questions, just ask
www.boomchicago.nl