We fly into Christchurch late at night and pick up our campervan the next day. We'll need to do some food shopping (any suggestions where?) but then want to set off to make the most of our days. We don't really want to stay in Christchurch the first day. Where is a reasonable target for the first day? Oamaru or beyond? Do we have to book a campsite or can we just park up somewhere nice if our campervan is self-contained?