Amsterdam is amazing! From the canals, to the multitude of museums, to the old funky buildings everything is so fascinating and beautiful. I spent three days there and I already want to go back. The party scene is great of course but the city is also very interesting for people who are more into the historic and sightseeing aspects. It's a very liberal and green city, and walking or biking through the city is very relaxing. The only downside is the cost but if you're careful it can be reasonable
Insider Tip:Buy tickets to anything you know you are going to visit far in advance as lines for certain attractions can be hours long. Also, definitely take public transport whenever you can instead of cabs, especially to and from the airport. The public transport system is incredibly easy to understand and use and cabs are very, very expensive. The trip to the airport only takes 20 minutes from central station and costs 5€ instead of 60€ by cab.