Hard choices: south island in 2 weeks

Hi! My name is Luca and I'm from Italy! First of all I have to apologize for my terrible English, but I hope you can somehow get what I mean. I'll be in NZ from Nov 25 to Dec 5 and I have the entire South Island to visit in 2 weeks. There are things I cannot miss (whalewatching in Kaikoura, a two-day cruise in Milford Sound, albatros and gannet colonies), and this of course does not leave me a long time for walking. Having some trekking experience in Nepal, Alaska and Patagonia, I'm planning to avoid overcrowded tramps (Abel Tasman and Milford) but in the same time I'd like to experience (read: walk) as many environments and lanscapes as possible. For this reason my most recent battleplan is to walk Hump Ridge Trail plus some day walks. Suggestions welcome! Thanks a lot for your help. Luca from Monza, Italy