Some of these are scenic, some are driven by buildings, some are historic and some are even arty. Details will follow, sometime.
Molesworth Street area (Old St Pauls, Beehive, Parliament, National Library, Old Government Buildings)
Railway Station - Harbourside - Te Papa
Interesting stuff in the City Centre
Mount Victoria
Botanic Gardens
Harbourside Walk
Te Aro Walk
Central Spine Walk
Central Business District Walk
West side Walk
Maritime Trail
Old Shoreline Trail
Māori Trail
Art Deco Trail
Idiotic Street Art Trail
More at: https://wellington.govt.nz/recreation/outdoors/walks-and-walkways/across-the-city/heritage-trails
https://wellington.govt.nz/recreation/outdoors/walks-and-walkways/top-20-welly-walks