if you are in the market for a few more BIG walks per month & live (or visiting) in the SE corner of Brisbane, have a look at http://www.meetup.com/Bush-club/ The aim of the group is to get outdoors.....track or no track.
"This is a group for keener-than-mustard types into multi-day off trail trekking and the occasional paddling trip whatever the season and feel they can keep pace with other likeminded persons. If you just have to get out this weekend and aren't satisfied unless you arrive home the following day feeling beat-up, welcome." quote from site.
We have done a few walks now & this group suits hikers with the stamina to cover 15-20 km a day (up hill & down dale) at a reasonable pace (between 2 - 6 km/hr).
Shawn