just found the tour company I was referring to earlier, it was Hawaii Forest & Trail:
http://hawaii-forest.com/index.php/t...tars_adventure
probably not the cheapest, but they take dang good care of you.
A couple other favorites, if you want the world's greatest pork chop fried in an heirloom cast iron pan, visit Manago Restaurant/Hotel. scary sketchy both inside and out, but that just heightens your senses.
my preferred Kona coffee place is Greenwell Farms, they do free grounds tours and are ridiculously enthusiastic about their beans. I still order batches of their stuff online a couple of times a year.