I found this info about a Maui Marc who teaches Anusara. Sound like him? The workshop is not the Dec 4-11 timeframe, but if he's the right dude, I can see where else he may be in December. BTW, the studio is about an hour drive from where I would stay in Napili. It looks like he teaches Anusara there several times a week.
Marc StPierre
TITLE:
Anusara Yoga Immersion
with Marc St.Pierre & Skeeter
TIME:
TBA
DATE:
October 27 - 31
PRICE:
TBA
MAUI STYLE (Level 1)
Part 1 of 108 hour course
Scroll down: http://www.thestudiomaui.com/calendar.htm#DEC
The Studio Maui will have a kirtan while I'm there, on the 7th.
Here's another one - linking you straight to their day retreats, which seem customizable by purpose/location: http://mauiyogaexperiences.com/blog/day-retreats/ Looks like she teaches out of Studio Maui.
This place looks cool too: http://yogaonmaui.com/maya/home/
Getting too sleepy to investigate, but I'm going to pick up my search here: http://www.yogadirectory.com/Retreats_and_Vacations/Hawaii/
And I haven't even started looking up surfing!