I feel sorry for your sister for getting married, life will never be the same for her...just kidding! :lol:
That's an amazing trip you're going to make. When you arrive in Amsterdam, be careful not to get attracted by the red lights during the night and 'friendly' women behind glas waving at you. Before you know it, all your travel money will go up in smoke and you'll be stuck in this little sh!thole we like to call The Netherlands :-D ;-)