The economics work out. With five extra days, it makes sense to drop into another city, and Bruges/Bruxelles are on the way to Bavaria. Train to Bruges from Den Haag would have been 280CAD, and then train onward to Wiesbaden another 300CAD. Our BMW rental will cost 787CAD plus gas. But we get much more flexibility, potentially cheaper AirBNBs (that can be outside the major towns), and we get to see scenery at our speed. And go where we want.