My husband and I want to take a big trip this year to celebrate my turning 30. We are going by ourselves (kids staying with grandparents) to both Paris and Amsterdam in September this year. Our dates are flexible, but we've narrowed it down to that month. We want to go for 10 days and take the train from Paris to Amsterdam. We're considering stopping in Brussels, but I'm not sure if I want to spend a night there, or if we should focus on the other cities. Does anyone have any tips on where to stay and things to do? I've been to both cities before, but it was when I was a broke college student, so this will be a different experience.