The Maui Oceanfront Marathon Course Maps
Pick up this Map at the Airport or your hotel. This is from one of two good driving maps of Maui
Scroll down to the second map that shows the start line and first 7 miles of the course in Kihei.
See interactive map on Map My Runs
You can scroll it, zoom it, grab it with your mouse, change it, etc..
You can pick up the unmarked map below at the airport while waiting for your bags (and probably at about a 1000 other places on the island).
Note: The 10K and Half Marathons are out and back races and both start at the Marathon finish line in Lahaina.