I learned to look both ways twice before crossing a bike path, tram track or road. Cyclists are riding very fast, so I tended to let them go by first before crossing. Dutch people tend to cross regardless, as long as the path is clear.
Dutch people will easily and graciously speak perfect English when asked. Dutch people are almost always very polite, gracious and genuine. Dutch men are very respectful to women (look you in the eye when conversing, no leering or cat-calling--wow!). Dutch people are very accepting to different races and orientations.
Although tips are not expected, I did tip 10% to 15% when I felt restaurant service was good. In the hotel room, I tipped € 5.00 after four nights.
When having drinks, I would buy a round of drinks for the table.
Being Canadian, I found I had to be a bit more assertive for service, excessive politeness will not get you anywhere.