The Wētā Cave.
Opened in 2008 to appease fans of the Wētā Workshop and Wētā FX films. The shop includes a free behind the scenes video you can watch in a mini-theatre and a mini museum displaying props from various films Wētā Workshop and Wētā FX(formerly Weta Digital) have been involved in over the last 30+ years. The Wētā Cave is open 9am to 5pm every day. Parking in this area is tough during week days, so you might want to try coming during the weekend. That being said you can obtain answers to the questions here without having to go in the Cave, although it's always worth a look :)
Final Location:
S41 18.AB(C+D+E) E174 49.354
A = The number of Trolls here
B = The sign that reads "PLEASE DO NOT CLIMB ON THE ?" how many letters are in the last word?
C = Number of dragons above entrance
D = Number of big frogs in the garden to the left of Hobbit Hole entrance
E = How many digits on one trolls hand?
Checksum = 17
Well done to huhugrub on getting the FTF, in under 2hours after going live!