I went fishing around Taupo. It is absolutely beautiful. Pretty much all sight fishing. I booked a guide for a half day in Taupo and would highly recommend it.
I went with "Dream Trout"
http://www.dreamtrout.com/
The guide i had was Leon Mcarthy. He is their head guide. He put me on some 20in+ trout on small streams.
Good Luck and have a great time. I cant wait to go back there.