My girl-friend and I plan to go camping on the South Island from Dec 19 to Jan 2 and were wondering about availability of DOC campgrounds. Many of those are on first-come first-served basis, no reservations possible. Will it be difficult to find a free campsite during that time of year? For example, along the Milford Sound highway 94 (north of Te Anau) there's a bunch of campsites that don't allow reservations. We are afraid that we arrive there sometime in the afternoon and all campsites are occupied.