The Andaz Maui is in Wailea, which is on the south west side of the island.  You will want to fly into Kahului Airport (OGG), which is Maui's main airport.  The drive from Kahului Airport to Wailea is approximately 35 minutes.  You can rent a car in advance or take an Uber into town.  Enterprise has locations at the Andaz and in Kihei if you want to only rent a car after the wedding festivities.  The Andaz provides a free shuttle for guests within a one-mile radius of the resort.