I have fished Maui 3 times. The first 2 times we didn't have any luck, but the third time I did a little more research on charters and found these guys
http://www.mauibluewaterfishing.com/index.html. We fished with them on Christmas day I lost about a 300 lb blue marlin at the boat and my dad boated a 209 lb. If you can afford it you want to get the boat to yourself. The first time I went out there we shared the boat to save money and one of the other people got sick and it really limited our day.