Lots of great places to eat and drink pretty much on every street. If you're going for Steak, try to find an Argentinian restaurant.
A few highlights though...
Boom Chicago at Leidseplein for a bit of comedy http://www.boomchicago.nl/boomchicago/,
Vondelpark is great for chilling,
Villa Zeezicht for apple pie http://www.yelp.co.uk/biz/villa-zeezicht-amsterdam-2
and Barney's on Haarlemmerstraat for brekkie and a very different (smoking) menu
The Jordaan area should be a must as is the Oud Kerk(Old Kirk), Stedelijk and Rijksmuseum.