The tracks that lead to these huts (if there are any) range from easy to extremely difficult. Some may be a day walk in, others for an overnight stay, while others will take multiple days. Back country skills may not always be needed but the majority will need some knowledge to take on the adventure. Huts can be busy places but some of the more isolated huts can be seldom visited. Because of this they can be on the DOC chopping block due to lack of funds. I am hoping that a series of geocaches at huts around the country may just encourage others to go to where few set foot, although this one is really popular with many.
To plan for your trips into the backcountry you can find a lot of information here. Always be prepared with the right equipment and food.
http://www.doc.govt.nz/parks-and-recreation/plan-and-prepare/safety-in-the-outdoors/
http://www.tramper.co.nz/
http://hutbagger.co.nz/
http://maps.doc.govt.nz/ A great resource to see locations of huts, tracks and other DOC related features.
The hike to Blue Lake Hut will be around the 3 hour mark, heading up from West Sabine Hut. We set off from the Jetty at Gowan Valley Road end and headed along the lake by boat to Sabine Hut jetty. Time from Sabine to West Sabine is around 5 hours and pretty much took that long carrying a full pack. When moving between hut locations be sure to leave your intentions.
The cache is a military match-stick capsule with screw cap. Please bring your own pen. The nearby hut is incredibly popular and also serves as a good base to head off on other adventures, including the nearby Lake Constance
Hope you enjoy your visit here and the clarity of the unique and pristine Blue Lake, a true gem worth a visit.