A fair theme is difficult to work with I agree, but it is the only area of the 'park' where the coaster can be located (I name the area 'Provincial Fair'). I think I will stick with the name Angus and perhaps have the queue building themed as the interior of a farm shed (farming equipment, hay bales etc).
Because I'm bored I will share my ideas (uni student on holidays lol)...
The park is a sort of New Zealand showcase attraction. The name New Zealand Adventure is stuck in my mind though I'm trying to think of something else because of the obvious DCA theft.
The coaster would be the anchor attraction of the Provincial Fair area, which would be split into two sub-areas - Rural Showcase and The Fairground.
Rural showcase would feature a miniature vineyard and winery building with tastings of famous NZ wines, a large Barnyard show building (entranceway themed as a real barn but the large interior hidden behind a berm/upwards-sloping sheep paddock) with farmyard nursery, exhibits on NZ's agricultural history, and sheep-shearing demonstrations, and finally an outdoor area with modern farming equipment demonstrations.
The Fairground would be themed on a rural A&P show fairground, with Merry-Go-Round, 'Dumbo'-style ride with Buzzy Bee Toy vehicles ( http://www.nznature.co.nz/nznat/items/images/bbtoy.jpg ), dodgem cars, Top Spin ('Wipeout') ride called Rodeo Clown, launched freefall ('Batwing') called The Barn Smasher that protrudes through a smashed-open barn-style station, ferris wheel, and of course the coaster - Angus.
The other (rather generically-named!) areas of the park are Crackle Creek (themed on an old South Island forestry/mining town), Harbour Town (complete with replica Cape Reinga lighthouse - http://www.bstnz.com/image/tour_1_capereinga1.jpg ), Kiwi Island (a natural NZ themed area with wildlife), Garden Plaza (themed to English Christchurch, the Garden City, complete with tram), and finally Alpine Heights (park entranceway, themed to a Southern Alps ski resort).
Can't believe I typed that out.