We are headed to the South Island in a week (arrive Feb 25)for a 21 day trip in a campervan. We were in New Zealand 2 years ago and naively thought we could do the North and South Island in 21 days. We realized that was an impossible task. We did see enough of the North Island in our campervan but came up way short on the South. So we are coming back to finish the job! We have read and researched what to see and where to go. We have read the blogs and have looked at maps and websites. We want to see everything that everyone talks about but we know that's not going to happen, realistically. We will be starting in Christchurch and want to concentrate on the south half. Basically down to the Catlins and up to Arthur's Pass. What should we absolutely not miss? Last time we drove a lot and didn't stop much to explore, a beautiful drive but not too relaxing. Any suggestions from those in the know would be appreciated. What is the best way to see Milford Sound? Coach-cruise-fly? Who is the best tour company to do Milford with? Any and all help would be greatly appreciated.