Yes you will have a blast!
I went two years ago when we won by a point, fans going wild.
It's a shame none of the territory boys aren/t playing, that's what the locals up there come for. No Jurrah , no Davey (and no more Wona )
But yeah I bought my ticket earlier that week leading up to the game, just on Mitchell street (the Flinders Street equivalent if you like) up in Darwin city from the Arts Centre there, reserved seat, right near the players race. So close to the action too, not like the 'G or Eithad!
ground is about 20 minutes out of town. plenty of buses will be running.
Should be a crowd of anywhere between 7000 - 10000 i reckon.
You should check out training during the week too if you're there early in the week! A really good opportunity to get up close and chat to the players/coaches - but you may have to catch a taxi for that one.
Ring up AFL NT too if ya get stuck, they'll give you all the info you need!
Enjoy the game.