We stayed four nights and found plenty to do in Nelson.
We enjoyed the amazing sunsets both from the downstairs flat where we stayed and from a viewing platform, which is a short walk up the drive.
Our hosts had family staying over the New Years holiday period, during our booking, which meant an early wake up time from noise both overhead and from the adjacent room. I would think that this is an unusual occurance but it made for a less enjoyable stay.
Breakfast, including home made jams etc was provided, which was an unexpected bonus.