We're getting adventurous on this 700km double loop out of Nelson, encompassing a wide variety of terrain and interesting sights. Now no way should you try and do this in a day, but take at least 2 or 3 or more to get the best out of it.
The road winds alongside many rivers, but particularly following the majestic Buller Gorge is one you'll remember, especially where it narrows to squeeze round the rock face! Once over the on West Coast you have dramatic seascapes, particularly with the blow holes at Punakaiki, plus the historical interests of places like Reefton.
Trekking back towards but not over the Lewis Pass, you can relax in the Hot Springs at Maruia and later enjoy the tranquil waters and woodland walks of Lake Rotoriti. Add to those all the activities, dining and shopping available in Nelson itself and you have the ingredients for a superb road trip.