From LAHAINA - Drive Southbound on Hwy 30 (Honoapi'ilani Hwy), as the road opens up after the tunnel, you will see a sign for Maalaea Harbor, and you will see Buzz's Wharf. Turn right at the Maalaea Harbor Sign & Traffic Light. If you pass the Maui Ocean Center on your right - then you've gone TOO FAR!
From KIHEI / WAILEA -*just remember that from the edge of Kihei it is 3 left Turns at each Traffic Light.
Drive Northbound on the Pi'ilani Hwy (Hwy 31), or S. Kihei Rd and follow the signs that take you to Hwy 31. Take HWY 31 to 310>get in the left turn lane to follow the signs pointing to Lahaina. Turn left onto Hwy 30 (Honoapi'ilani Hwy). About 1 mile farther, you will see the main intersection for Maalaea and the Maui Ocean Center Aquarium sign on your left. Turn left at the traffic light and drive into the harbor.