Glad you enjoyed your time here!
'Oostenburger' is literally Eastern borough - see this etymology. IJ is prononced as the y in why.
I f'ckn love pepernoten - they are only supposed to be eaten in the Fall, before Sinterklaas. There's a specialty pepernoten store here where you can get all kinds of chocolate coverings for it with a few dozen types of chocolate.
The thing about bikes that I love here is that they are upright - you ride them with a straight back, as opposed to pretty much every bike I've seen in North America. It's technically less stable, but it is much more comfortable over longer, casual rides which is why they are the norm here. I park my bike regularly in the world's biggest bike garage, which already houses 7500 bikes but will soon house 12500.