Here's a free bonus for Bunnies & Burrows fans:
Return to Druid's Valley by B. Dennis Sustarre and Lev Lafayette.
Pg 35-38 of
RPG Review Issue #3 (March 2009)
http://rpgreview.net/files/rpgreview_3.pdf
This is a revision of Sustarre's article from Different Worlds #3 (June/July 1979), which described a B&B campaign setting called Druid's Valley, and was one of a handful of articles ever published for the original rules. The revision is stated to be printed with permission of Sustarre and Tadashi Ehara (DW editor). It uses much of the text of the original article, and while it's revised for the GURPs version of B&B, there are very few stats or rule references. The map is a copy of the original.
Steve Jackson Games also offer a conversion for the original B&B rules to GURPS (written by Steffen O'Sullivan, who wrote the GURPS B&B):
http://www.sjgames.com/gurps/articles/BnB.to.GURPS.html