What does one remember the most on any trip? It's always the mishaps and the unplanned detours that we would have never anticipated! We experienced a lot of such things on our 15-day trip to New Zealand covering North Island and South Island.
Tip no. 1 - Always travel in a group with multiples of 4 and make sure you have 2 people who can drive in each group. Becomes a lot more economical and convenient.