Yeh, If I was you I'd still do it. But just be aware that when you book the activities with the tour manager, you don't know what the weathers going to be like on the day. and if you get a rainy day then its too bad.
im doing the grand explorer new zealand contiki tour in june/july this year. should i consider doing the Milford Sounds optional. I read ur comment on the discussion thread. Is it really that good you made it sound really horrible. Advice? Please as I want to see as much of NZ and so as many fun optional extras as possible :) Thx!