it varies on how busy the huts are as to where they are, as you'd expect the more remote the hut the less if any people you will come across.
the trip you are taking isnt taken by a lot of people, the only familiarity i have with the area is from flying over at high altitude and bits and pieces i've read.
i'ts not a high use area, but a lot of the huts are small so it can just take one party to fill a hut up. on the whole you should get a bunk most if not all nights but its still not guaranteed.
arthurs pass has a lot of tracks , you can walk the river valleys and i have put together a two week trip running around the northern side of the park
as much as anything you string together a bunch of tracks to make one long trip
rmembre doc dont record trip intentions anymore in most of the national parks . best to make a plan and stick to it as best you can and make sure someone you know , knows what you are doing.
you cant rely on walking a lot of the rivers if it rains heavily, and you have to plan to be trapped by heavy rain.
further north and easier terrain is the lewis pass area. not a lot of tracks but you can traverse a lot of the countryside if you know what you're doing.
further south of arthurs pass is more rugged terrain, if you're traversing the mountains you need experience in alpine and glacier travel, spectacular scenery but it bites the inexperienced.
http://www.adventuresmart.org.nz/Outdoo ... efault.asphttp://www.topomap.co.nz/NZTopoMap/nz32 ... Canterburyhttp://www.doc.govt.nz/parks-and-recreation/tracks-and-walks/canterbury/north-canterbury-and-arthurs-pass/http://www.softrock.co.nz/mg/index.php