Honolulu International Airport has designated areas where taxis may pick up customers.
These are the areas outside the Baggage Claims on Level 1 (click image for larger version):
Illustrated maps for Bag Claim level pick-up areas:
Pre-Arranged 1 Area (Bag Claim 6-11)
Pre-Arranged 3Area (Bag Claim 16-21)
Pre-Arranged 5 Area (Bag Claim 22-31)
International Arrival Area