I'm seriously considering going on the last weekend of the month. My wife's into Christmas markets, and they probably have a reasonable one in Nuremberg (last xmas we went to Baden Baden, which was fantastic). From Brussels, flights and trains are pretty much the same, price-wise, with the difference being that the train trip's around 6-7 hrs and the flights only a couple (with 1 stop-over). One day going round Nuremberg cause I've never been, and the Fun Park a morning or an afternoon. I'm not really interested in the rides etc; I only want to go there to buy stuff from the shop. Either way, if what VK said is true re transport, makes more sense to stay in Nuremberg unless you have children or have an unsuppressable klicky fetish. The hotels are probably better and there would be more variety, entertainment-wise, in the evenings.