If you are getting married on the Kohala Coast, then I wouldn't suggest going all the way to Kona to get your hair/make-up done...it can take 45 minutes or more each way.
We got married at the Mauna Lani Bay Hotel & Bungalows, I got my hair/make-up done at the Paul Brown Salon & Spa at the Hapuna Beach Prince Resort. Paul Brown is very well known in Hawaii, he's got a nice boutique chain of salons on a few islands. I've gotten my hair/make-up done at a couple of their Oahu locations as well and have been consistently happy with their work.
I've got a vendor review in my Knot MARRIED bio below.
You may want to check out the Hawaii message board on The Knot, lots of helpful girls there :) Just go to www.theknot.com then hit "Talk" then find "HI - All Areas" under "Local Boards"
Good luck!
Knot planning bio: http://tinyurl.com/2od5dr
Knot married bio: http://tinyurl.com/2zatxp