[Tiger]

My best advice is not to plan too much. I went for five weeks and only planned the hotel room for the first few days in paris just so I had a place to stay right off the bat. I ended up travelling to belgium, holland (I stayed in Den Haag rather than amsterdam because locals told me to do day trips from den haag rather than stay there. best advice ever, the tourist area of amsterdam is ugly compared to the rest of the city/country), from there I flew to ireland with ryanair for extremely cheap (0.01 euros + tax) and spent two weeks driving around ireland.

So don't plan too much, if you have a plan set in stone you'll end up leaving placing you like too early to see places that may not be as good. You'll miss some stuff but no matter what you do you'll miss stuff.